Submission #407366

#	Time	Username	Problem	Language	Result	Execution time	Memory
407366		peuch	The Big Prize (IOI17_prize)	C++17	0 / 100	9 ms	6164 KiB

prize

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

int find_best(int n) {
	srand(time(0));
	vector<vector<int> > a(n);
	int maxi = 0;
	vector<int> ord;
	for(int i = 0; i < n; i++) ord.push_back(i);
	random_shuffle(ord.begin(), ord.end());
	for(int i = 0; i < ord.size(); i++){
		if(a[i].empty()) a[i] = ask(ord[i]);
		
		if(a[i][0] == 0 && a[i][1] == 0) return ord[i];
		if(a[i][0] + a[i][1] > maxi) maxi = a[i][0] + a[i][1];
		
		if(a[i][0] + a[i][1] == maxi){
			int ini = i, fim = n - 1;
			bool flag = false;
			while(ini != fim){
				int mid = (ini + fim) >> 1;
				if(ini == fim - 1) mid = fim;
				if(a[mid].empty()) a[mid] = ask(ord[mid]);
				
				if(a[mid][0] == 0 && a[mid][1] == 0) return ord[mid];
				if(a[mid][0] + a[mid][1] > maxi){
					maxi = a[mid][0] + a[mid][1];
					flag = true;
					break;
				}
				
				if(a[mid][0] != a[i][0] || a[mid][1] != a[i][1]) fim = mid - 1;
				else ini = mid;
			}
			if(!flag) i = ini;
		}
	}
	
	return ord[n - 1];
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:12:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   12 |  for(int i = 0; i < ord.size(); i++){
      |                 ~~^~~~~~~~~~~~

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