Submission #779542

#	Time	Username	Problem	Language	Result	Execution time	Memory
779542		CSQ31	The Big Prize (IOI17_prize)	C++17	20 / 100	61 ms	12572 KiB

prize

#include "prize.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) (int)(a.size())
#define all(a) a.begin(),a.end()
typedef pair<int,int> pii;
int loli = 0;
vector<vector<int>>memo(222222,{-1,-1});
vector<int>res;
int cnt = 0;
void query(int x){
	if(memo[x][0] == -1){
		cnt++;
		assert(cnt<=9999);
		memo[x] = ask(x);
	}
	res = memo[x];
}
int ans = 0;
void solve(int l,int r,int cntl,int cntr){
	//cout<<l<<" "<<r<<" "<<cntl<<" "<<cntr<<'\n';
	int mid = (l+r)/2,L,R;
	L = R = -1;
	
	for(int i=mid;i>=l;i--){
		query(i);
		if(res[0]+res[1] == 0){
			ans = i;
			return;
		}
		if(res[0]+res[1] != loli)continue;
		L = i;
		break;
	}
	if(L!=-1){
		if(res[0]-cntl){
			solve(l,L-1,cntl,res[1]);
		}
		int c = mid-L;
		if(res[1]-cntr-c)solve(mid+1,r,res[0]+c,cntr);
		return;
	}
	///
	for(int i=mid+1;i<=r;i++){
		query(i);
		if(res[0]+res[1] == 0){
			ans = i;
			return;
		}
		R = i;
		break;
		
	}
	if(R == -1)return;
	if(res[1] - cntr){
		solve(R+1,r,res[0],cntr);
	}
}
int find_best(int n) {	
	int p = 0;
	for(int i=0;i<min(n,477);i++){
		query(i);
		if(res[0]+res[1] == 0)return i;
		if(res[0]+res[1] > loli){
			loli = res[0]+res[1];
			p = i;
		}
		if(loli >= 27)break;
	}
	query(p);
	solve(p,n-1,res[0],0);
	return ans;
}

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