Submission #1540552

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Source Code Expand

#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;
string a;
int b[26];
int main(){
  cin >> a;
  int len=a.length();
  for(int i=0;i<len;i++){
    b[a[i]-'a']++;
  }
  int ans=0;
  for(int i=0;i<len;i++){
    ans+=(len-i-b[a[i]-'a']);
    b[a[i]-'a']--;
  }
  cout << ans+1 << endl;
  return 0;
}

Submission Info

Judge Result