Submission #797296

#	Time	Username	Problem	Language	Result	Execution time	Memory
797296		firewater	The Big Prize (IOI17_prize)	C++14	0 / 100	5 ms	1080 KiB

prize

#include "prize.h"
#include <vector>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define ll long long
using namespace std;











#define MX 202300
int n,m,l,r,mx,mid,x,p[MX];
vector<int>s;
struct Tree
{
	int c[MX];
	void add(int x)
	{
		x++;
		for(;x<=n;x+=x&-x)
			c[x]++;
		return;
	}
	int ask(int x)
	{
		x++;
		int sum=0;
		for(;x;x-=x&-x)
			sum+=c[x];
		return sum;
	}
}T;
int find(int x)
{
	int now=0;
	if(!p[now])x--;
	while(x){
		now++;
		while(p[now])now++;
		x--;
	}
	return now;
}
int find_best(int N) {
	n=N;
	mx=0;
	for(int i=0;i<min(500,n);++i){
		s=ask(i);
		mx=max(mx,s[0]+s[1]);
	}
	for(int i=0;i<n;++i)
		p[i]=0;
	m=n;
	while(1){
		l=1;r=m;
		while(l<r){
			mid=l+r>>1;
			x=find(mid);
			s=ask(x);
			if(s[0]+s[1]!=mx){
				l=mid;
				break;
			}
			if(s[0]>T.ask(x))r=mid-1;
			else l=mid+1;
		}
		if(s[0]+s[1]==0)return l;
		p[l]=1;
		T.add(1);
	}
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:66:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   66 |    mid=l+r>>1;
      |        ~^~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 80