Tsinsen A1118 多位数连接

http://oj.tsinsen.com/A1118###

分析:注意比较函数是a+b>b+a,不是a>b。反例为a = 1231, b = 123

代码:

#include "bits/stdc++.h"
using namespace std;

bool f(string & a, string & b) {
    return a + b > b + a;
}

int main() {
    int n; cin >> n;
    string s[25];
    for (int i = 0; i < n; ++i)
        cin >> s[i];
    sort(s, s + n, f);
    for (int i = 0; i < n; ++i)
        cout << s[i];
    return 0;
}

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