Submission #1867497

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Source Code Expand

#include<cstdio>
#include<cstring>
#include<algorithm>
#include<map>
using namespace std;
int a[200005],n;
map<int,int> f;
int v[200005];
void ins(int x){for(;x<=n;x+=(x&(-x)))v[x]++;}
int qry(int x){int r=0;for(;x;x-=(x&(-x)))r+=v[x]; return r;}
int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
		f[a[i]]=0;
	}
	int cnt=0;
	for(map<int,int>::iterator it=f.begin();it!=f.end();it++)
		it->second=++cnt;
	int mx=0;
	long long ans=0;
	for(int i=1;i<=n;i++){
		if(a[i]>=mx){mx=a[i]; ins(f[a[i]]); continue;}
		int v0=i-qry(f[a[i]])-1,v1=mx-a[i];
		if(v0<=v1){
			ins(f[a[i]]);
			ans+=v0;
		}else{
			ins(mx);
			ans+=v1;
		}
	//	printf("%d %d %d\n",v0,v1,ans);
	}
	printf("%lld\n",ans);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:12:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:14:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&a[i]);
                    ^

Judge Result