제출 #48438

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
48438		aleksami	Vudu (COCI15_vudu)	C++14	56 / 140	1065 ms	65536 KiB

vudu

#include <bits/stdc++.h>

using namespace std;
#define MAXN 1000005
typedef long long ll;
ll a[MAXN];
int tree[4*MAXN];
vector <ll> v;

void update(int node,int left,int right,int idx,int val)
{
	if(left==right)
	{
		tree[node]+=val;
		return ;
	}
	int mid=left+right>>1;
	if(idx <= mid)update(node*2,left,mid,idx,val);
	if(idx > mid)update(node*2+1,mid+1,right,idx,val);
	tree[node]=tree[node*2]+tree[node*2+1];
}
int query(int node,int left,int right,int l,int r)
{
	if(left >= l && right <= r)return tree[node];
	int mid = left+right>>1;
	int ans=0;
	if(l <= mid)ans+=query(node*2,left,mid,l,r);
	if(r > mid)ans+=query(node*2+1,mid+1,right,l,r);
	return ans;
}

set <ll> st;

int main()
{
	ios_base::sync_with_stdio(false);
	int n;
	cin >> n;
	for(int i = 1; i <= n; i++)
	{
		cin >> a[i];
	}
	ll p;
	cin >> p;
	for(int i = 1; i <= n; i++)
	{
		a[i]-=p;
	}
	//v.push_back(0LL);
	st.insert(0LL);
	for(int i = 1; i <= n; i++)
	{
		a[i]+=a[i-1];
		st.insert(a[i]);//v.push_back(a[i]);
	}
	for(auto x:st)v.push_back(x);
	//sort(v.begin(),v.end());
	ll ans=0;
	for(int i = 0; i <= n; i++)
	{
		a[i]=lower_bound(v.begin(),v.end(),a[i])-v.begin();
		if(i!=0)update(1,0,v.size()-1,a[i-1],1);
		ans += 1LL*query(1,0,v.size()-1,0,a[i]);
	}
	cout << ans;
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

vudu.cpp: In function 'void update(int, int, int, int, int)':
vudu.cpp:17:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=left+right>>1;
          ~~~~^~~~~~
vudu.cpp: In function 'int query(int, int, int, int, int)':
vudu.cpp:25:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid = left+right>>1;
            ~~~~^~~~~~

• Subtask 1: 56 / 140