Submission #1539938

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <vector>
#include <utility>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <ctime>

using namespace std;

const int MAXN = 200000 + 10;

long long n;
char s[MAXN];
long long pos[MAXN];

void Work()
{
	scanf("%s", s);
	n = strlen(s);
	for (int i = 0; s[i]; i ++)
		pos[s[i] - 'a'] ++;

	long long ans = (n * (n - 1)) / 2LL;
	for (int i = 0; i < 26; i ++)
		ans -= pos[i] * (pos[i] - 1) / 2LL;

	printf("%lld\n", ans + 1);
}

int main()
{
	Work();
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘void Work()’:
./Main.cpp:21:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", s);
                ^

Judge Result