Submission #617769

#	Time	Username	Problem	Language	Result	Execution time	Memory
617769		AbdelmagedNour	The Big Prize (IOI17_prize)	C++17	20 / 100	85 ms	336 KiB

prize

#include<bits/stdc++.h>
using namespace std;
#include "prize.h"
int MAX,res=-1;
bool is_max(vector<int>x){
    return x[0]+x[1]==MAX;
}
void divide(int l,int r){
    if(l>r||res!=-1)return;
    if(l==r){
        vector<int>x=ask(l);
        if(x[0]+x[1]==0)res=l;
        return;
    }
    vector<int>x=ask(l);
    if(!is_max(x)){
        if(x[0]+x[1]==0)res=l;
        divide(l+1,r);
        return;
    }
    vector<int>y=ask(r);
    if(!is_max(y)){
        if(y[0]+y[1]==0)res=r;
        divide(l+1,r-1);
        return;
    }
    if(x[0]==y[0]&&x[1]==y[1])return;
    int md=(l+r)>>1;
    divide(l,md);
    divide(md+1,r);
}
int find_best(int n){
    MAX=0;
    res=-1;
    for(int i=0;i<min(n,500);i++){
        vector<int>x=ask(i);
        if(x[0]+x[1]==0)return i;
        MAX=max(MAX,x[0]+x[1]);
    }
    divide(500,n-1);
	return res;
}

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