Submission #1541918

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Source Code Expand

#include <cstdio>
#include <algorithm>
#include <set>
#include <string>

using namespace std;

int n;
char s[222222];
long long c[256];
set<string> vs;

int main(void) {
  scanf("%s", s);
  for (n = 0; s[n]; n++);
  long long res = (long long)n*(n-1)/2 + 1;
  for (int i = 0; i < n; i++) {
    c[int(s[i])] += 1;
  }
  for (int i = 0; i < 256; i++) {
    res -= (c[i]*(c[i]-1))/2;
  }
  printf("%lld\n", res);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s", s);
                 ^

Judge Result