C++ 代码

#include <iostream>
#include <cstdlib>
#include <vector>
#include <algorithm>
#include <string>
#include<set>
using namespace std;
int main()
{
    int a, b, c;
    scanf("%d/%d/%d",&a,&b,&c);

    vector<string> ans;

    int month[13] = { 0,31,28,31,30,31,30,31,31,30,31,30,31 };

    int st[3][3] = { a,b,c ,
                    c,a,b,
                    c,b,a, };

    for (int i = 0;i < 3;i++) {
        int y = st[i][0];
        int m = st[i][1];
        int d = st[i][2];

        if (y >= 60) {
            y += 1900;
        }
        else {
            y += 2000;
        }

        if (y % 400 == 0 || (y % 4 == 0 && y % 100 != 0)) {
            month[2] = 29;
        }

        if (m <= 12 && d <= month[m]&&m>0&&d>0) {
            string s;
            s += to_string(y);
            s += "-";
            if (m < 10) {
                s += "0";
                s += to_string(m);
            }
            else {
                s += to_string(m);
            }
            s += "-";
            if (d < 10) {
                s += "0";
                s += to_string(d);
            }
            else {
                s += to_string(d);
            }
            ans.push_back(s);
        }

        month[2] = 28;
    }

    sort(ans.begin(), ans.end());

    set<string> s (ans.begin(), ans.end());
    ans.assign(s.begin(), s.end());


    for (string a:ans) {
        cout << a << endl;
    }

}