Submission #576697

#	Time	Username	Problem	Language	Result	Execution time	Memory
576697		Vanilla	Connecting Supertrees (IOI20_supertrees)	C++17	46 / 100	370 ms	22204 KiB

supertrees

#include <bits/stdc++.h>
#include "supertrees.h"
using namespace std;
const int maxn = 1002;
int d[maxn];

int dad (int x) {
	return d[x] = (x == d[x] ? x: dad(d[x]));
}

void merge (int a, int b){
	a = dad(a);
	b = dad(b);
	d[b] = a;
}


int construct(vector<vector<int>> p) {
	int n = p.size();
	vector <vector <int> > b (n, vector <int> (n, 0));
	for (int i = 0; i < n; i++){
		d[i] = i;
	}
	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			for (int k = j + 1; k < n; k++){
				if (p[i][j] == 1 && p[j][k] == 1 && p[i][k] != 1) return 0;
			}
		}
	}
	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			if (p[i][j] == 3) return 0;
			if (p[i][j] == 1 && dad(i) != dad(j)) {
				b[i][j] = b[j][i] = 1;
				merge(i,j);
			}
		}
	}
	for (int i = 0; i < n; i++){
		vector <int> v;
		v.push_back(dad(i));
		for (int j = i + 1; j < n; j++){
			if (p[i][j] == 2 && dad(i) != dad(j)) {
				v.push_back(dad(j));
				merge(i, j);
			}
		}
		if (v.size() == 2) return 0;
		if (v.size() > 1)
			for (int i = 0; i < v.size(); i++){
				int p1 = v[i], p2 = v[(i + 1) % v.size()];
				b[p1][p2] = b[p2][p1] = 1;
			}
	}
	build(b);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |    for (int i = 0; i < v.size(); i++){
      |                    ~~^~~~~~~~~~

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