Submission #1013414

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013414		NintsiChkhaidze	The Big Prize (IOI17_prize)	C++17	0 / 100	8 ms	10328 KiB

prize

#include <bits/stdc++.h>
#define pb push_back
#include "prize.h"
using namespace std;

bool fix[200003];
int Q;
vector <int> dp[200003];

vector <int> askk(int x){
	
	Q++;
	
	return ask(x);
}

int find_best(int n){
	
	int block = 500,mx = -1,idx = -1;
	vector <int> opt;
		
	for (int i = 0; i < min(n,block); i++){
		vector <int> vec = askk(i);
		int sum = vec[0] + vec[1];
		if (sum == 0) return i;
		
		if (sum > mx){
			mx = sum;
			opt = vec;
			idx = i;
		}
	}

	for (int i = idx; i < n; i++){
		vector <int> vec = askk(i);
		if (vec[0] + vec[1] == 0) {
			return i;
		}
		if (vec[0] + vec[1] != mx) {
			fix[i] = 1;
			continue;
		}
		
		opt = vec;
		int id = i;
		int l = i, r = n - 1,res = i;
		
		for (int j = 18; j >= 0; j--){
			int c = i + (1<<j) - 1;
			if (c >= n) continue;
			vector <int> vec = askk(c);
			if (vec == opt) {
				res += (1<<j);
			}
		}
		
		for (int j = id; j <= res; j++)	
			fix[j] = 1;
			
		i = res;
	}
	
	for (int i = 0; i < n; i++){
		if (!fix[i]){
			vector <int> vec = askk(i);
			if (vec[0] + vec[1] == 0) {
				return i; 
			}
		}
	}
	
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:46:7: warning: unused variable 'l' [-Wunused-variable]
   46 |   int l = i, r = n - 1,res = i;
      |       ^
prize.cpp:46:14: warning: unused variable 'r' [-Wunused-variable]
   46 |   int l = i, r = n - 1,res = i;
      |              ^
prize.cpp:20:15: warning: control reaches end of non-void function [-Wreturn-type]
   20 |  vector <int> opt;
      |               ^~~

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