Submission #1539820

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Source Code Expand

#include <cstdio>
#include <cstring>

using namespace std;

int a[26];
char s[200001];

int main() {
    int n, i;
    long long ans = 0;
    
    scanf("%s", s);
    
    n = strlen(s);
    
    for (i = 0; i < n; i++) a[s[i] - 'a']++;
    
    ans = (long long)n * (n - 1) / 2 + 1;
    
    for (i = 0; i < 26; i++) ans -= (long long)a[i] * (a[i] - 1) / 2;
    
    printf("%lld\n", ans);
    
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:13:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s);
                   ^

Judge Result