Submission #5803637


Source Code Expand

Copy
#include "bits/stdc++.h"
using namespace std;

using ll = long long;
int INF = numeric_limits<int>::max() / 2;
ll LINF = numeric_limits<ll>::max() / 2;
int MOD = 1e9 + 7;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    string s;
    cin >> s;
    ll n = s.size();
    vector<ll> alpha(26,0);
    ll ans = n * (n-1) / 2 + 1;
    for(int i = 0; i < n; i++){
        alpha[s[i] - 'a']++;
    }
    for(int i = 0; i < 26; i++){
        ans -= alpha[i] * (alpha[i] - 1) / 2;
    }
    cout << ans << endl;
}

Submission Info

Submission Time
Task B - Reverse and Compare
User satake
Language C++14 (GCC 5.4.1)
Score 500
Code Size 543 Byte
Status
Exec Time 2 ms
Memory 720 KB

Judge Result

Set Name Score / Max Score Test Cases
Sample 0 / 0 sample_01.txt, sample_02.txt, sample_03.txt
All 500 / 500 sample_01.txt, sample_02.txt, sample_03.txt, sample_01.txt, sample_02.txt, sample_03.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt
Case Name Status Exec Time Memory
sample_01.txt 1 ms 256 KB
sample_02.txt 1 ms 256 KB
sample_03.txt 1 ms 256 KB
subtask_1_01.txt 1 ms 256 KB
subtask_1_02.txt 2 ms 720 KB
subtask_1_03.txt 1 ms 256 KB
subtask_1_04.txt 1 ms 256 KB
subtask_1_05.txt 1 ms 256 KB
subtask_1_06.txt 1 ms 256 KB
subtask_1_07.txt 1 ms 256 KB
subtask_1_08.txt 2 ms 720 KB
subtask_1_09.txt 2 ms 720 KB
subtask_1_10.txt 2 ms 720 KB
subtask_1_11.txt 2 ms 720 KB
subtask_1_12.txt 2 ms 720 KB
subtask_1_13.txt 2 ms 720 KB
subtask_1_14.txt 2 ms 720 KB
subtask_1_15.txt 2 ms 720 KB
subtask_1_16.txt 2 ms 720 KB
subtask_1_17.txt 2 ms 720 KB