Codeforce Problem 711A - Bus to Udayland (正则表达式)
https://codeforces.com/problemset/problem/711/A
正则表达式基本应用
#include<bits/stdc++.h>
using namespace std;
int n, i;
string s, t;
int main() {
//freopen("in.txt", "r", stdin);
cin >> n; while (n--)cin >> s, t += s + "\n";//将字符累加到一个大字符串中
i = t.find("OO");//也可以用match替换
if (i >= 0)t.replace(i, 2, "++"), cout << "YES" << endl << t;
else cout << "NO";
return 0;
}