Submission #911165

#	Time	Username	Problem	Language	Result	Execution time	Memory
911165		kachu	Coreputer (IOI23_coreputer)	C++17	20 / 100	1 ms	344 KiB

coreputer

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "coreputer.h"

using namespace std;
using namespace __gnu_pbds;

#define oset tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> 
#define ofind find_by_order
#define okey order_of_key

#define pque priority_queue
#define dque deque
#define que queue
#define umap unordered_map
#define uset unordered_set
#define pipii pair<int, pair<int,int>>
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define ppb pop_back
#define pf push_front
#define ppf pop_front
#define iter iterator
#define endl '\n'
#define MOD 1000000007
#define INF 1e18

vector<int> malfunctioning_cores(int N){
	vector<int> ans;
	for (int i = 0; i < N; i++)
		ans.pb(0);
	
	int low = 0, high = N / 2, pivot, res;
	
	while (low <= high){
		int mid = (low + high) / 2;
		
		vector<int> query;
		for (int i = 0; i <= mid; i++)
			query.pb(i);
		
		res = run_diagnostic(query);
		
		if (res == 0 || res == 1)
			high = mid - 1;
		else
			low = mid + 1;
	}
	
	pivot = low;
	ans[pivot] = 1;
	
	if (res == 0){
		for (int i = 0; i < pivot; i++){
			vector<int> query;
			query.pb(i);
			for (int j = pivot + 1; j < N; j++)
				query.pb(j);
			
			int re = run_diagnostic(query);
			
			if (re == 1)
				ans[i] = 1;
		}
		
		int cnt1 = 0;
		for (int i = 0; i <= pivot; i++)
			cnt1 += ans[i];
			
		for (int i = pivot + 1; i < N - 1; i++){
			vector<int> query;
			for (int j = 0; j <= pivot; j++)
				query.pb(j);
			query.pb(i);
			
			int re = run_diagnostic(query);
			
			if (re == 1)
				ans[i] = 1;
		}
		
		int cnt2 = 0;
		for (int i = pivot + 1; i < N - 1; i++)
			cnt2 += ans[i];
		
		ans[N - 1] = (cnt1 - cnt2);
	}

	return ans;
}

Compilation message (stderr)

coreputer.cpp: In function 'std::vector<int> malfunctioning_cores(int)':
coreputer.cpp:55:2: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
   55 |  if (res == 0){
      |  ^~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40