洛谷黄题求助

陈尚涵

题目：https://www.luogu.com.cn/problem/P7911
呜呜呜，我做了半小时，本以为会直接ac，现实给了我一巴掌，55分
这边两个样例都是正确过了的，我这边没看题解，说一下我的思路，就是写一个函数验证地址是否符合要求，然后呢其他的就在循环里判断，用continue进行下一个的操作，我这代码也真的绝了，一道黄题106行
这边呢只需要提供我的代码错误的地方，不需要你们提供正确的代码，提供代码的绝对是不给最佳答案的，代码长点是因为全是缩进而我没有省略，还是比较好读的，希望大佬积极帮助
@sfqxx @zhangjinxuan @歌者文明清理员 @liuhongrun2022 来帮我看看
代码如下：

#include <iostream>
#include <string>
using namespace std;
struct node {
        int type;
        string ad;
} a[1005];
bool isAdCorrect(string ad) {
        int onep = 0;
        int twop = 0;
        int nlen = 0;
        int cnt = 1;
        int sum = 0;
        for (int i = ad.length() - 1; i >= 0; i--) {
                if (ad[i] >= '0' && ad[i] <= '9') {
                        nlen++;
                        sum += cnt * (ad[i] - '0');
                        cnt *= 10;
                } else if (ad[i] == '.') {
                        if (ad[i+1] == '0' && nlen > 1) {
                                return false;
                        }
                        if (sum > 255) {
                                return false;
                        }
                        if (twop < 1) {
                                return false;
                        }
                        onep++;
                        nlen = 0;
                        sum = 0;
                        cnt = 1;
                } else if (ad[i] == ':') {
                        if (ad[i+1] == '0' && nlen > 1) {
                                return false;
                        }
                        if (sum > 65535) {
                                return false;
                        }
                        if (onep > 0) {
                                return false;
                        }
                        twop++;
                        nlen = 0;
                        sum = 0;
                        cnt = 1;
                } else {
                        return false;
                }
        }
        if (onep != 3 || twop != 1) {
                return false;
        }
        return true;
}
int main() {
        int n;
        cin >> n;
        for (int i = 1; i <= n; i++) {
                string op;
                cin >> op;
                if (op == "Server") {
                        a[i].type = 0;
                        cin >> a[i].ad;
                        if (!isAdCorrect(a[i].ad)) {
                                cout << "ERR" << endl;
                                continue;
                        }
                        bool flag = true;
                        for (int j = 1; j < i; j++) {
                                if (a[j].type == 0 && a[j].ad == a[i].ad) {
                                        cout << "FAIL" << endl;
                                        flag = false;
                                        break;
                                }
                        }
                        if (!flag) {
                                continue;
                        }
                        cout << "OK" << endl;
                } else if (op == "Client") {
                        a[i].type = 1;
                        cin >> a[i].ad;
                        if (!isAdCorrect(a[i].ad)) {
                                cout << "ERR" << endl;
                                continue;
                        }
                        bool flag = false;
                        for (int j = 1; j < i; j++) {
                                if (a[j].type == 0 && a[j].ad == a[i].ad) {
                                        cout << j << endl;
                                        flag = true;
                                        break;
                                }
                        }
                        if (flag) {
                                continue;
                        }
                        cout << "FAIL" << endl;
                } else {
                        a[i].type = -1;
                        cin >> a[i].ad;
                }
        }
        return 0;
}

isdkz

这道题目是一个关于IP地址验证和处理的问题。根据您提供的代码，我发现了一些错误和可以改进的地方。

1. 验证IPv4和IPv6格式的错误：
您的代码中有一些验证IPv4和IPv6地址的逻辑，但存在一些错误。对于IPv4地址，每个分段的取值范围应该是0到255，而不是65535。对于IPv6地址，每个分段的取值范围应该是0到65535，而不是255。请注意修正这些取值范围的判断条件。

2. 循环判断逻辑：
在处理输入的IP地址时，您使用了循环，并在其中使用了  continue  语句。但是，这样的做法可能会导致在一些情况下错过对其他IP地址进行验证的机会。具体来说，当输入的  op  不是 "Server" 或 "Client" 时，您没有进行IP地址的验证，而是直接将其记录为类型为 -1 的地址。建议您在处理这种情况时也进行地址验证，以保证数据的完整性和正确性。

3. 类型  type  使用建议：
虽然您在代码中定义了  type  字段来区分服务器和客户端，但在代码的实际运行中，并没有充分利用这个字段。建议您在验证通过后将类型  type  和IP地址  ad  存储在不同的容器中，以便在后续处理中更方便地根据类型进行查找。

4. 函数命名和代码可读性：
函数  isAdCorrect  的命名并不是很直观，建议将其改为更能反映其作用的名字，例如  isValidIP 。此外，代码的可读性也可以进一步改进，可以使用更具描述性的变量名和注释，使得代码更易于理解和维护。

根据上述指点，您可以进行相应的修改和调整，以解决代码中的问题。如果在修改后仍然遇到困难或有其他问题，请随时在 StackOverflow 上继续寻求帮助。祝您成功解决问题！

陶远航

根据你提供的代码，我注意到有几个问题。首先，在isAdCorrect函数中，你对IP地址进行验证的逻辑存在一些错误。具体来说，你在判断.和:之后的数字是否为0时，条件应该是nlen == 1而不是nlen > 1。此外，在判断四个.和一个:的数量时，你使用的条件是onep != 3 || twop != 1，这将导致即使有多个.或多个:也会被认为是正确的。正确的条件应该是onep == 3 && twop == 1。

除了上述问题，我还注意到在主函数中，你对循环的起始值设置为1，但数组a的索引是从0开始的。因此，你应该将循环的起始值改为0。

综上所述，以下是修正后的代码：

#include <iostream>
#include <string>
using namespace std;

struct node {
    int type;
    string ad;
} a[1005];

bool isAdCorrect(string ad) {
    int onep = 0;
    int twop = 0;
    int nlen = 0;
    int cnt = 1;
    int sum = 0;

    for (int i = ad.length() - 1; i >= 0; i--) {
        if (ad[ i] >= '0' && ad[ i] <= '9') {
            nlen++;
            sum += cnt * (ad[ i] - '0');
            cnt *= 10;
        } else if (ad[ i] == '.') {
            if (ad[i+1] == '0' && nlen == 1) {
                return false;
            }
            if (sum > 255) {
                return false;
            }
            if (twop < 1) {
                return false;
            }
            onep++;
            nlen = 0;
            sum = 0;
            cnt = 1;
        } else if (ad[ i] == ':') {
            if (ad[i+1] == '0' && nlen == 1) {
                return false;
            }
            if (sum > 65535) {
                return false;
            }
            if (onep > 0) {
                return false;
            }
            twop++;
            nlen = 0;
            sum = 0;
            cnt = 1;
        } else {
            return false;
        }
    }

    if (onep == 3 && twop == 1) {
        return true;
    }
    
    return false;
}

int main() {
    int n;
    cin >> n;

    for (int i = 0; i < n; i++) {
        string op;
        cin >> op;

        if (op == "Server") {
            a[ i].type = 0;
            cin >> a[ i].ad;

            if (!isAdCorrect(a[ i].ad)) {
                cout << "ERR" << endl;
                continue;
            }

            bool flag = true;

            for (int j = 0; j < i; j++) {
                if (a[j].type == 0 && a[j].ad == a[ i].ad) {
                    cout << "FAIL" << endl;
                    flag = false;
                    break;
                }
            }

            if (!flag) {
                continue;
            }

            cout << "OK" << endl;

        } else if (op == "Client") {
            a[ i].type = 1;
            cin >> a[ i].ad;

            if (!isAdCorrect(a[ i].ad)) {
                cout << "ERR" << endl;
                continue;
            }

            bool flag = false;

            for (int j = 0; j < i; j++) {
                if (a[j].type == 0 && a[j].ad == a[ i].ad) {
                    cout << j + 1 << endl;
                    flag = true;
                    break;
                }
            }

            if (flag) {
                continue;
            }

            cout << "FAIL" << endl;

        } else {
            a[ i].type = -1;
            cin >> a[ i].ad;
        }
    }

    return 0;
}

希望这些修改能够解决你的问题。如果还有其他疑问，请随时提问。
如果问题已经解决，请设置最佳答案

陈尚涵

懒得专门为上面两位gpt先生回复了，看了一下，都是错的

陈尚涵

这么长的代码好像没人愿意看

Ewan-Ahiouy

一百多行？！

陈尚涵

Ewan-Ahiouy 发表于 2023-7-29 17:54
一百多行？！

缩进很占代码量，其实还是容易看懂地

Ewan-Ahiouy

好像很简单的鸭子，我先做做看先

陈尚涵

Ewan-Ahiouy 发表于 2023-7-29 17:56
好像很简单的鸭子，我先做做看先

zhangjinxuan

https://www.luogu.com.cn/record/109358197

tommyyu

这题正好是我那年考csp做的

陈尚涵

tommyyu 发表于 2023-7-29 18:00
这题正好是我那年考csp做的

就是原题

歌者文明清理员

算法/非py不要@我

tommyyu

这是其中一个 WA 的输入，我给大家看一下

1000
Client 25.71.134.48:30588
Client 25.71.134.48:00588
Client 25.71.134.48:305883
Client 6879287681::07:609027
Server 53.254727.98:62299:
Client 78.130.139.51:51682
Client 1::054833:2.7:
Server 50.193.23.89:46872
Server 100.250.202.27:5224
Server 5.:05:148288.62
Client 26.71.134.48:30588
Client 100.250.202.27:5224
Server 1117139.1580124:94137
Client 199.36.250.121:36597.
Server 119.33.64.7:53367
Server 100.250.202.20:522496
Server 239.93.98.86:6430
Client 25:71.134.48:.0588:
Client 212.112.29.226:561018
Client 43.212.17.131:60012
Client 25.71.134.48:30588.
Server 225.152.143.177:18650
Client 180.51.226.5:26024
Server 139.130.189.162:28130
Server 163.29.48.109:21528
Server :894.52801424175.8923
Client 139.130.189.162:28130
Server 150.194495.187:467591
Client 88.81.154.231:24324
Server 128.109.123.223:33112
Server 171.10.159.85:58713
Client 583033:.69:4
Server 117.255.58.106:37283
Server 88.81.154.231:24324
Server 153.233.179.93:64529
Client 161.79.208.114:18708
Client :197616::.624::12::23
Server 033.23.59.154:45249.
Server 155.220.151.33:148610
Client 143.112.173.29:52878
Server 50.136.0.88:3680
Client 160.121.201.211:2411607
Client 153.233.179.93:645294
Client 94.23.255.111:29533
Server 12.15.67.223:18110
Server 232.109.249.6:4100954.81
Server 106.176.73.43:22009
Server 176.146.170.252:36552
Server 70.13.244.197:4942
Server 31.229.244.222:585274
Client 88.81.158.231:943242.129
Server 126.202.131.61:47527
Server 171.10.159.85:587133
Client 176.146.170.252:36552.
Server 43.93.147.21:53560
Server 187.10.30.61:43553
Client 25.71.134.4893058896
Server 189.253.80.219:6241
Server 59.12.140.227:60602
Server 186.80.226.9:4541
Client 186.80.226.9:4541
Server 154.142.144.79:54464
Client 50.136.0.88:3680
Client 225.152.143.107:1865083
Server 5943818::05:.565222745
Server 220.97.238.53:30899
Server 16.204.88.247:65177
Client 79.130.139.51:516821
Client 110.209.131.22:404675:
Client 12.15.67.223:08110
Server .03.6.54.19::427194
Client 226.28.205.194:27618
Client 186.202.131.61:47527
Client 215.153.156.173:50723
Server 167.246.193.109:19053
Client 189.253.80.219:6241
Client 25.71.134.40:30578
Client 142.181.92.211:14201
Client 208.65.4.178:2681
Client 187.10.30.61:43553
Server 132.42.90.78:15218
Client 2.172.251.149:453991
Server 74.181.17.129:4131
Client :622
Server 173.223.153.245:18188
Client 174.61.29.49:59523
Server 131.191.202.63:52330
Client 158.2.191.253:44049
Server 56.180.138.216:54987
Server 220.122.52.195:51211
Server 170.57.58.71:11621
Server 229.238.132754:28664
Client 74.155.26.70:23577
Client 142..01.92.211:14201
Server 237.90.204.167:34380
Server 136.14.8.14:14404
Client 50.19..23.89:46872
Client 153.233.179.93:64529
Client 237.90.204.477:34380
Client 88.81.154.231.243248
Client 128.109.123.223:33172
Client 220.122.52.195:51211
Server 225.244.38.205:32434
Server :
Client 148.1.1.92.211:14201:
Server 250.709167.123:62431
Server 67.66.123.23:55404
Server 65.12.96.221:48538
Server 32766:1.82::6.29.2.94
Server 4...
Client 154.142.144.79:54464
Server 1101.12.253:58170
Client 1:6.80.226.9:4541
Client 96.98.186.178:23991
Client 150.244.30.159::7009
Client 225.152.143.177:18650
Server 65.17.147.254:171900
Server 24.165.237.104:62182
Server 64.87.25.79:25899
Client 56.180.138.216:549879
Server 86.235.238.181:462056
Client 138.2.191.253:44049
Client 50.136.0.88:36807
Server 44.98.129.156:65334
Server 8:1929
Client 131.191.202.63:52330
Client 128.248.86.117:21531
Server 234.28.105.66:18752
Server 152.177.104.81:4048
Client 220.97.238.53:30899
Client 210.9.30.76:1364
Server 254.2.231.76:32109
Client 74.181.17.129:4131
Client 0.60
Server 113.97.94.210:59051
Server 90.193.151.82:6512
Client 234.28.105.66:18752
Client 167.246.193.109:19053
Server 99.74.83.2:19998
Server 175.105.35.227:63841
Server 25.71.124.48:3058.1
Server 185.186.75.131:32726
Client 173.223.153.245:18188
Server 43.213.192.255:53709
Client 165.140.199.224:1893214
Client 67.66.123.23:55404
Server 174.190.35.96:26926
Client 22.223.146.222:5364
Server 215.204.199.93:8647
Client 207.6.104.14:500831
Client 97.34034.54:70447287
Client 82.211.46.11:48999
Server 226.1.213.10:9691
Client .11855220
Client 142.181.92.211:1420128
Client 125.122.255.102:11451
Server 29.93.96.231:6010
Server 85.179.43.5:41687
Client 24.165.237.104:62182
Server 117.24.40.7.:39234572
Server 155.46.201.117:35081
Server 150.195.223.91:26260
Client 186.80.226.9:45415
Server 29.116.65.63:14998.
Client 210.131.206.245:1751580
Server 59
Server 3.110.47.21:28119
Server 96.98.186.178:23991
Server ..7:35622808817
Server 1:5.4727.88
Server 87.29.77.199:38605.
Server 86.78.212.199:36531
Client 98.121.87.156:5798
Server 154.229.150.177:24886
Client 85.179.43.5:41687
Server 235.188.0.238:36689
Server 115.20.164.98:9867
Server 154.95.104.106:4694
Client 50.136.0.88:36803:
Client 67.66.123.23:55404.
Client 00.193.23.89:468729
Client 67.66.123.27:554042
Client 117.255.58.106:37283
Server 209.140.35.127:54020
Client 43.213.192.255:53709
Client 41.249.207.209:61768
Server 196.119.190.199:4042
Client 56.180.138.216:54987
Client 142.181.92.211:14401
Server 59.235.77.161:40919
Client 1395130.189.162:28130
Server 170.158.33.240:58629
Client 86:5.:43.7.215.61.143.46:
Client 99.74.83.2:19998
Server 66.176.187.75:48347
Client 209.140.35.127:54020
Server 189.85.120.116:61357
Client 215.246.8.96:58255
Client 215.204.199.93:8647
Server 131.150.111.232:41041
Server 231.92.61.232:5637
Client 254.2.231.76:32109
Client 125.122.255.102:11451.
Client 215.204.199.03:86473
Server 254.127.253.180:43706
Client 137.42.90.78:15218
Server .93547:8.1:56:1:3275.
Client 170.158.33.240:58629
Server 152.33.183.117:29397
Client 167.246.193.109:190539
Server 35.40.187.244:27636
Client 163.20.48.109:215282:
Client .87.06
Client 85..79.43.5:416879
Client 225.122:143.177:186507
Client 156.55.108.236:13330
Client 185.186075.131:32726
Server 22.227.99.91:13807
Client 660174.10.31:34966
Client 237.90.204.167:34380
Client 88.204.207.101:28776.
Client 176.146.170.252:36552
Client 35.40.187.244:27636
Server 52.3.107.54032011
Server 162.26.91.29:49723
Client 225.244.38.205:32434
Server 203.175.177.24:29840
Client 126.202.131.61:47527
Client 64.87.25.79:25899
Client 189.253.80.219:62418
Client 12.15.67.223:18110
Client 170.193.68.184:27586
Server 201.107.87.59:36655
Server 114.697.46.138:412417
Server 0.99.75.149:55221
Server 11.21.243.92:251436
Client 153.56.74.224:03494.
Client 135.92.58.220:43797
Server 53.142.90.106:63335
Server 212.133.148.22:30236
Client 226.1.213.10:9691
Server 119.33.64.7:533674
Client 4.6.26885:
Client 167.16.127.50:43445
Server :63.28.484109:215287236
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Ewan-Ahiouy

歌者文明清理员 发表于 2023-7-29 18:05
算法/非py不要@我

这不是算法，模拟和枚举而已

Ewan-Ahiouy

tommyyu 发表于 2023-7-29 18:09
这是其中一个 WA 的输入，我给大家看一下

！

zhangjinxuan

你可以尝试模仿一下我的算法，你想一想，我们使用 sscanf 来格式化读取这个字符串，然后，啊对。

与其在臃肿的代码上删删改改，不如一切重新开始。

tommyyu

zhangjinxuan 发表于 2023-7-29 18:16
你可以尝试模仿一下我的算法，你想一想，我们使用 sscanf 来格式化读取这个字符串，然后，啊对。

与其在 ...

确实。晒一下我的代码

#include<bits/stdc++.h>
using namespace std;
int n;
map<string,int> server;
bool check(string ip)
{
        int t[6]={0,-1,-1,-1,-1,-1};
        int cnt = sscanf(ip.c_str(),"%d.%d.%d.%d:%d",&t[1],&t[2],&t[3],&t[4],&t[5]);
        if(cnt != 5) return false;
        for(int i=1;i<=4;i++)
        {
                if(t[i]<0 || t[i]>255) return false;
        }
        if(t[5]<0 || t[5]>65535) return false;
        char now[30];
        sprintf(now,"%d.%d.%d.%d:%d",t[1],t[2],t[3],t[4],t[5]);
        if(string(now) != ip)
                return false;
        return true;
}
int main()
{
        cin>>n;
        string s,t;
        for(int i=1;i<=n;i++)
        {
                cin>>s>>t;
                if(!check(t))//检查ip地址是否合法
                {
                        cout<<"ERR"<<endl;
                        continue;
                }
                if(s=="Server"){
                        if(server[t]==0)
                        {
                                server[t]=i;
                                cout<<"OK"<<endl;
                        }
                        else
                                cout<<"FAIL"<<endl;
                }
                else
                {
                        if(server[t]>0)
                                cout<<server[t]<<endl;
                        else
                                cout<<"FAIL"<<endl;
                }
        }
        return 0;
}

感觉差不多应该是这样

zhangjinxuan

tommyyu 发表于 2023-7-29 18:17
确实。晒一下我的代码感觉差不多应该是这样

对啊，sscanf 简直是一个非常简便的函数

tommyyu

zhangjinxuan 发表于 2023-7-29 18:18
对啊，sscanf 简直是一个非常简便的函数

我认为他可以手动逐行比对一下 14# 和 17#，看一下到底哪里出错了