Submission #3596661

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Source Code Expand

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define lo long long 
#define inf 1000000000
#define md 1000000007
#define pb push_back
#define li 200005
using namespace std;
int n,k,A[li],pre[li],fe[li+1005],cev;
vector< pair<int,int> > v;
void update(int x){
	for(int i=x;i<=n+1;i+=(i&-i)) fe[i]++; 
}
int que(int x){
	int res=0;
	for(int i=x;i>=1;i-=(i&-i)) res+=fe[i];
	return res;
}
int main(){
	scanf("%d %d",&n,&k);
	for(int i=1;i<=n;i++) {scanf("%d",&A[i]);A[i]-=k;}
	for(int i=1;i<=n;i++) pre[i]=pre[i-1]+A[i];
	v.pb(mp(0,0));
	for(int i=1;i<=n;i++){
		v.pb(mp(pre[i],i));
	}
	sort(v.begin(),v.end());
	for(int i=0;i<(int)v.size();i++){
		update(v[i].se+1);
		if(v[i].se==0) continue;
		cev+=que(v[i].se);
	}
	printf("%d\n",cev);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&k);
                      ^
./Main.cpp:23:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) {scanf("%d",&A[i]);A[i]-=k;}
                                          ^

Judge Result