算呗

洛谷传送门

#include <bits/stdc++.h>
using namespace std;
string zm[30] = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen", "twenty","a", "both", "another", "first", "second", "third"};
int sz[30] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,1,2,1,1,2,3};
int a[7],cnt;
int main() {
    string s;
    for(int i = 1;i <= 6;i++){
        cin >> s;
        for(int j = 0;j < 26;j++){
            if(zm[j] == s && sz[j] * sz[j] % 100 != 0){
                a[cnt++] = sz[j] * sz[j] % 100;
            }
        }
    }
    sort(a,a + cnt);
    cout << a[0];
    for(int i = 1;i < cnt;i++){
        if(a[i] < 10) cout << 0 << a[i];
        else cout << a[i];
    }
    return 0;
}