Submission #320195

#	Time	Username	Problem	Language	Result	Execution time	Memory
320195		Karen124	PIN (CEOI10_pin)	C++14	20 / 100	1068 ms	107412 KiB

pin

#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll N = 5e5 + 5;
const ll INF = 1e18 + 10;
int n, d, ans;
string a[N], b;
unordered_map <string,  int> cn;
char add[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 
              'i', 'g', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'x'};
int f(string s1, string s2){
    int ret = 0;
    for (int i = 0; i < 4; i++){
        ret += (s1[i] != s2[i]);
    }
    return ret;
}
int main (){
    cin >> n >> d;
    if (n <= 2000){
        for (int i = 0; i < n; i++){
            cin >> a[i];
            for (int j = 0; j < i; j++){
                ans += (f(a[i], a[j]) == d);
            }
        }
        cout << ans << '\n';
        return 0;
    }
    if (d == 1)
    for (int i = 0; i < n; i++){
        cin >> a[i];
        for (int j = 0; j < 36; j++){
            if (add[j] == a[i][0]) continue;
            b = a[i];
            b[0] = add[j];
            ans += cn[b];
        }
        for (int j = 0; j < 36; j++){
            if (add[j] == a[i][1]) continue;
            b = a[i];
            b[1] = add[j];
            ans += cn[b];
        }
        for (int j = 0; j < 36; j++){
            if (add[j] == a[i][2]) continue;
            b = a[i];
            b[2] = add[j];
            ans += cn[b];
        }
        for (int j = 0; j < 36; j++){
            if (add[j] == a[i][3]) continue;
            b = a[i];
            b[3] = add[j];
            ans += cn[b];
        }
        cn[a[i]] ++;
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 20 / 100