大整数排序

简单的字符串排序，用到了sort()函数，关键在于cmp规则的编写

#include <iostream>
#include <cstring>
#include <string>
#include <algorithm>
using namespace std;
#define _for(i, a, b) for(int i = a; i < b; i++)
bool cmp(string a, string b){
    int lena = a.length(), lenb = b.length();
    if(lena != lenb)
        return lena < lenb;
    return a < b;
}
int main(){
    int n;
    cin >> n;
    string s[110];
    _for(i, 0, n){
        cin >> s[i];
    }
    sort(s, s + n, cmp);
    _for(i, 0, n){
        cout << s[i] << endl;
    }
    return 0;
}