Submission #3366105

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Source Code Expand

#include<cstdio>
#include<cstring>
const int MAXN=200005;

int n;
char str[MAXN];
int cnt[30];

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

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:11:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",str);
                 ^

Judge Result