Submission #1540556

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Source Code Expand

#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
using namespace std;
#define pb push_back
int dy[]={0, 0, 1, -1, 1, 1, -1, -1};
int dx[]={1, -1, 0, 0, 1, -1, -1, 1};

#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n) for (int i=0;i<(n);i++)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define mp make_pair
#define fi first
#define sc second
char s[300000];
ll cou[30];
ll com2(ll n){
    if(n < 2)
        return 0;

    ll m = n - 1;

    if(n % 2)
        m /= 2;
    else
        n /= 2;
    return n * m;
}
int main(){
    cin >> s;

    ll n = strlen(s);

    REP(i,30){
        cou[i] = 0;
    }
    REP(i,n){
        cou[s[i] - 'a']++;
    }
    ll ans = 1 + com2(n);

    REP(i,30)
        ans -= com2(cou[i]);
    cout << ans << endl;
    return 0;
}

Submission Info

Judge Result