纯纯暴力，写的想吐，玛德服了。

但是复习了vector去重方法，日期的合法性判断。 

#include <iostream>
#include <vector>
#include <cstring>
#include <algorithm>using namespace std;
vector<int> res;
string s;
int d[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; int leap(int year)
{if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) return 1;else return 0;
}int check(int year, int month, int data)
{if(year < 1960 || year > 2059) return -1;if(month < 1 || month > 12) return -1;if(data <= 0) return -1;if(month == 2){if(data > leap(year) + d[month]) return -1;}else{if(data > d[month]) return -1;}int res = (year * 100 + month ) * 100 + data;return res;
}int main()
{cin >> s;int a = (s[0] - '0') * 10 + s[1] - '0';int b = (s[3] - '0') * 10 + s[4] - '0';int c = (s[6] - '0') * 10 + s[7] - '0';if(check(1900 + a, b, c) != -1) res.push_back(check(1900 + a, b, c));if(check(2000 + a, b, c) != -1) res.push_back(check(2000 + a, b, c));if(check(1900 + c, a, b) != -1) res.push_back(check(1900 + c, a, b));if(check(2000 + c, a, b) != -1) res.push_back(check(2000 + c, a, b));if(check(1900 + c, b, a) != -1) res.push_back(check(1900 + c, b, a));if(check(2000 + c, b, a) != -1) res.push_back(check(2000 + c, b, a));sort(res.begin(), res.end());res.erase(unique(res.begin(), res.end()), res.end());for(int i = 0; i < res.size(); i ++){int year = res[i] / 10000;int month = res[i] % 10000 / 100;int data = res[i] % 100;cout << year << "-";if(month >= 0 && month <= 9) cout << 0 << month << "-";else cout << month << "-";if(data >= 0 && data <= 9) cout << 0 << data << endl;else cout << data << endl;}return 0;
}