PAT 甲级 1038 Recover the Smallest Number

https://pintia.cn/problem-sets/994805342720868352/problems/994805449625288704

 

Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given { 32, 321, 3214, 0229, 87 }, we can recover many numbers such like 32-321-3214-0229-87 or 0229-32-87-321-3214 with respect to different orders of combinations of these segments, and the smallest number is 0229-321-3214-32-87.

Input Specification:

Each input file contains one test case. Each case gives a positive integer N (≤) followed by N number segments. Each segment contains a non-negative integer of no more than 8 digits. All the numbers in a line are separated by a space.

Output Specification:

For each test case, print the smallest number in one line. Notice that the first digit must not be zero.

Sample Input:

5 32 321 3214 0229 87

Sample Output:

22932132143287

代码：

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

const int maxn = 1e5 + 10;
int N;

struct Node{
    string s;
}node[maxn];

bool cmp(const Node& a, const Node& b) {
    return a.s + b.s < b.s + a.s;
}

int main() {
    scanf("%d", &N);
    for(int i = 0; i < N; i ++)
        cin >> node[i].s;
    sort(node, node + N, cmp);
    string ans = "";
    for(int i = 0; i < N; i ++)
        ans += node[i].s;
    int len = ans.length();
    int cnt = 0, temp = 0;
    for(int i = 0; i < len; i ++) {
        if(ans[i] != '0') {
            temp = i;
            break;
        }
        else cnt ++;
    }
    if(cnt == len)
        printf("0");
    else {
        for(int i = temp; i < len; i ++)
            cout << ans[i];
    }
    printf("\n");
    return 0;
}

之前好像在  LeetCode 上做过类似的题目