Submission #976966

#	Time	Username	Problem	Language	Result	Execution time	Memory
976966		Error404	The Big Prize (IOI17_prize)	C++17	20 / 100	960 ms	1048576 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
#define pi pair<int,int>
#define f first
#define s second
const int MAX_N = 2e5;
int ans[MAX_N][2];

bool found = false;
int pos;

int last ;
pi q(int l){
    if(ans[l][0]!=-1) return {ans[l][0], ans[l][1]};
    else{
       auto hold  = ask(l);
        ans[l][0] =hold[0];
        ans[l][1] =hold[1];
        return {ans[l][0], ans[l][1]};
     // return {0,1};
    }
}


void solve( int l, int r ) {
    if(found) return;

    if(l>r) return;
    int m = (l+r)/2;
    pi res = q(m);

    if(res.f ==0 && res.s==0){
        pos = m;
        found = true;
        return;
    }

    if(res.f<res.s){
        if(res.f!=0){
            solve(l,min(m,last-1));
        }
        if(res.s!=0){
            solve(max(0,m+1),r);
        }
    }
    else{
          if(res.f!=0){
            solve(l,min(m,last-1));
        }
        if(res.s!=0){
            solve(max(0,m+1),r);
        }

    }


}

int find_best( int n ) {
    for( int i = 0; i < n; i++ )
        ans[i][0] = ans[i][1] = -1;
    last = n-1;
    solve( 0, n - 1 );

    return pos;
}

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