轻院1874: 蛤玮学计网

 题目链接:https://acm.zzuli.edu.cn/zzuliacm/problem.php?id=1874

划水题，但是需要注意的方面太多，最好考虑全面再写代码

个人感觉使用stringstream方便一点，可以将字符串快速分开

代码：

#define _CRT_SECURE_NO_WARNINGS
#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<string>
#include<iostream>
#include<sstream>
using namespace std;


bool check(string s)
{
    int dotnum = 0;
    for (int i = 0; i < s.size(); i++)
        if (s.at(i) == '.') s[i] = ' ', dotnum++;
    if (dotnum > 3) return false;
    string str[5] = {};
    stringstream ss;
    ss << s;
    for (int i = 0; i < 4; i++)
        ss >> str[i];
    for (int i = 0; i < 4; i++) {
        if (str[i] == "" || str[i].size() > 3) return false;
        int ai = 0;
        for (int j = 0; j < str[i].size(); j++) {
            if (str[i].at(j) < '0' || str[i].at(j) > '9') return false;
            else {
                ai *= 10;
                ai += str[i].at(j) - '0';
            }
        }
        if (ai < 0 || ai>255) return false;
    }
    return true;
}

int main()
{
    ios::sync_with_stdio(true);
    int t;
    cin >> t;
    for (int i = 1; i <= t; i++)
    {
        string s;
        cin >> s;
        if (!check(s)) {
            cout << "No" << endl;
        }
        else
            cout << "Yes" << endl;
    }
    return 0;
}