AtCoder Grand Contest 019

Submission #5803637

Source codeソースコード

#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

Task問題 B - Reverse and Compare
User nameユーザ名 satake
Created time投稿日時
Language言語 C++14 (GCC 5.4.1)
Status状態 AC
Score得点 500
Source lengthソースコード長 543 Byte
File nameファイル名
Exec time実行時間 2 ms
Memory usageメモリ使用量 720 KB

Test case

Set

Set name Score得点 / Max score Cases
Sample - 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

Test case

Case name Status状態 Exec time実行時間 Memory usageメモリ使用量
sample_01.txt AC 1 ms 256 KB
sample_02.txt AC 1 ms 256 KB
sample_03.txt AC 1 ms 256 KB
subtask_1_01.txt AC 1 ms 256 KB
subtask_1_02.txt AC 2 ms 720 KB
subtask_1_03.txt AC 1 ms 256 KB
subtask_1_04.txt AC 1 ms 256 KB
subtask_1_05.txt AC 1 ms 256 KB
subtask_1_06.txt AC 1 ms 256 KB
subtask_1_07.txt AC 1 ms 256 KB
subtask_1_08.txt AC 2 ms 720 KB
subtask_1_09.txt AC 2 ms 720 KB
subtask_1_10.txt AC 2 ms 720 KB
subtask_1_11.txt AC 2 ms 720 KB
subtask_1_12.txt AC 2 ms 720 KB
subtask_1_13.txt AC 2 ms 720 KB
subtask_1_14.txt AC 2 ms 720 KB
subtask_1_15.txt AC 2 ms 720 KB
subtask_1_16.txt AC 2 ms 720 KB
subtask_1_17.txt AC 2 ms 720 KB