Codeforces Solution-B. Choosing Symbol Pairs-Solution in C, C++, Java, Python

great10

7

aaaaaaaaaa

100

#1 Code Example with C++ Programming

Code - C++ Programming

#include <cstdio>
#include <iostream>
#include <vector>

int main(){
    
    const int N = 256;
    std::vector<long long> counts(N,0);

    std::string input; getline(std::cin, input);
    for(long k = 0; k < input.size(); k++){++counts[input[k]];}

    long long total(0);
    for(long k = 0; k < N; k++){total += counts[k] * counts[k];}

    printf("%lld\n", total);

    return 0;
}

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