Submission #908280

#	Time	Username	Problem	Language	Result	Execution time	Memory
908280		zyq181	Coreputer (IOI23_coreputer)	C++17	0 / 100	1 ms	344 KiB

coreputer

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

vector<int> malfunctioning_cores(int N){
	if(N == 2){
		if(run_diagnostic({0}) == 1){
			return {0};
		}
		else if(run_diagnostic({0}) == -1){
			return {1};
		}
		else{
			return {0, 1};
		}
	}
	vector<int> them;
	vector<int> q;
	int ret;
	int cur;
	for(int a=0; a<N; a+=2){
		q.push_back(a);
	}
	ret = run_diagnostic(q);
	if(ret == 1){
		int t;
		q.clear();
		for(int a=1; a<N; a+=2) q.push_back(a);
		for(int a=0; a<N; a+=2){
			q.push_back(a);
			t = run_diagnostic(q);
			if(t != -1){
				cur = a;
				them.push_back(a);
				break;
			}
		}
		for(int a=cur+2; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != -1){
				them.push_back(a);
			}
		}
		int k = them.size();
		if(t == 0){
			k--;
		}
		q.clear();
		for(int a=0; a<k-1; a++){
			q.push_back(them[a]);
		}
		q.push_back(0);
		for(int a=1; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != -1) them.push_back(a);
		}
	}
	else if(ret == -1){
		int t;
		for(int a=1; a<N; a+=2){
			q.push_back(a);
			t = run_diagnostic(q);
			if(t != -1){
				cur = a;
				them.push_back(a);
				break;
			}
		}
		for(int a=cur+2; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != -1){
				them.push_back(a);
			}
		}
		int k = them.size();
		if(t == 0){
			k--;
		}
		q.clear();
		for(int a=0; a<k-1; a++){
			q.push_back(them[a]);
		}
		q.push_back(0);
		for(int a=0; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != -1) them.push_back(a);
		}
	}
	else{
		q.push_back(1);
		for(int a=1; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != 0) them.push_back(a);
		}
		int k = them.size();
		q.clear();
		for(int a=0; a<k-1; a++){
			q.push_back(them[a]);
		}
		q.push_back(0);
		for(int a=0; a<N; a+=2){
			q.pop_back();
			q.push_back(a);
			if(run_diagnostic(q) != -1) them.push_back(a);
		}
	}
	sort(them.begin(), them.end(), greater<int>());
	vector<int> r;
	for(int a=0; a<N; a++){
		if(them.back() == a){
			r.push_back(1);
			them.pop_back();
		}
		else{
			r.push_back(0);
		}
	}
	return r;
}

Compilation message (stderr)

coreputer.cpp: In function 'std::vector<int> malfunctioning_cores(int)':
coreputer.cpp:38:16: warning: 'cur' may be used uninitialized in this function [-Wmaybe-uninitialized]
   38 |   for(int a=cur+2; a<N; a+=2){
      |             ~~~^~

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