Submission #282910

#	Time	Username	Problem	Language	Result	Execution time	Memory
282910		turbat	The Big Prize (IOI17_prize)	C++14	90 / 100	106 ms	400 KiB

prize

#include<bits/stdc++.h>
#include "prize.h"
using namespace std;
int find_best(int n) {
  	int l, r, mx = -1e9;
    for (int i = 0;i < min(10, n);i++){
      	int ind = rand() % n;
  		vector<int> res = ask(ind);
     	if(res[0] + res[1] == 0)
            return i;
        mx = max(mx , res[0]+res[1]);
	}
    for(int i = 0; i < n; i++){
        vector<int> res = ask(i);
        if(res[0] + res[1] == 0)
            return i;
        mx = max(mx , res[0]+res[1]);
        if((res[0]+res[1]) < mx) continue;
        l = i + 1;
        r = n - 1;
        while(l <= r){
            int mid = (l+r)/2;
            vector<int> tmp=ask(mid);
            if(tmp[0]+tmp[1]==0)return mid;
            if(tmp == res){
                i = mid;
                l = mid+1;
            }
            else r = mid-1;
        }
    }
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:32:1: warning: control reaches end of non-void function [-Wreturn-type]
   32 | }
      | ^

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80