Submission #733875

#	Time	Username	Problem	Language	Result	Execution time	Memory
733875		ismayil	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	0 ms	212 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
const int MAX = 1e3 + 3;
int par[MAX];
int find(int u){
	if(par[u] < 0) return u;
	return par[u] = find(par[u]);
}
bool unite(int u, int v){
	u = find(u), v = find(v);
	if(u == v) return false;
	if(par[u] > par[v]) swap(u, v);
	par[u] += par[v];
	par[v] = u;
	return true;
}
int construct(vector<vector<int>> p) 
{
	memset(par, -1, sizeof(par));
	int n = p.size();
	vector<vector<int>> answer(n, vector<int>(n, 0));
	int mark[n] = {0};
	for (int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(p[i][j] == 1){
				answer[i][j] = answer[j][i] = 1;
			}else if(p[i][j] == 2){
				unite(i, j);
			} 
		}
	}
	for(int i = 0; i < n; i++){
		if(mark[find(i)]) continue;
		mark[find(i)] = 1;
		vector<int> v;
		for(int j = 0; j < n; j++){
			if(find(i) == find(j)){
				v.push_back(j);
			}
		}
		if(v.size() == 1) continue;
		if(v.size() == 2) return 0;
		for(int j = 0; j < v.size() - 1; j++) answer[v[j]][v[j + 1]] = answer[v[j + 1]][v[j]] = 1;
		answer[v[v.size() - 1]][v[0]] = answer[v[0]][v[v.size() - 1]] = 1;
	}
	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:44:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |   for(int j = 0; j < v.size() - 1; j++) answer[v[j]][v[j + 1]] = answer[v[j + 1]][v[j]] = 1;
      |                  ~~^~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4