Submission #576156

#	Time	Username	Problem	Language	Result	Execution time	Memory
576156		Vanilla	Connecting Supertrees (IOI20_supertrees)	C++17	40 / 100	216 ms	22936 KiB

supertrees

#include <bits/stdc++.h>
#include "supertrees.h"
using namespace std;
const int maxn = 1002;
int dsu[3][maxn];
set <int> comp [3][maxn];

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

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


int construct(vector<vector<int>> p) {
	int n = p.size();
	vector <vector <int> > b (n, vector <int> (n));
	for (int i = 0; i < n; i++){
		dsu[0][i] = dsu[1][i] = dsu[2][i] = i;
		comp[1][i].insert(i);
		comp[2][i].insert(i);
	}
	for (int i = 0; i < n; i++){
		for (int j = 0; j < i; j++){
			merge(i,j, dsu[p[i][j]]);
		}
	}
	for (int i = 0; i < n; i++){
		for (int j = 0; j < i; j++){
			if (p[i][j] == 0 && (get_dad(i, dsu[1]) == get_dad(j, dsu[1]) || get_dad(i, dsu[2]) == get_dad(j, dsu[2]))) return 0;
			if (p[i][j] == 1 && get_dad(i, dsu[2]) == get_dad(j, dsu[2])) return 0;
			if (p[i][j] == 2 && get_dad(i, dsu[1]) == get_dad(j, dsu[1])) return 0;
			if (p[i][j] == 1) comp[1][get_dad(i, dsu[1])].insert(j);
			if (p[i][j] == 2) comp[2][get_dad(i, dsu[2])].insert(j);
		}
	}
	for (int i = 0; i < n; i++){
		if (comp[1][i].size() != 1) {
			// cout << "1 " << i << ": ";
			vector <int> v;
			for (int j: comp[1][i]) {
				// cout << j << " ";
				v.push_back(j);
			}
			// cout << "\n";
			for (int j = 0; j < v.size() - 1; j++){
				b[v[j]][v[j + 1]] = b[v[j + 1]][v[j]] = 1;
			}
		}
		if (comp[2][i].size() != 1){
			if (comp[2][i].size() == 2) return 0;
			// cout << "2 " << i << ": ";
			vector <int> v;
			for (int j: comp[2][i]) {
				// cout << j << " ";
				v.push_back(j);
			}
			// cout << "\n";
			for (int j = 0; j < v.size(); j++){
				b[v[j]][v[(j + 1) % v.size()]] = b[v[(j + 1) % v.size()]][v[j]] = 1;
			}
		}
	}
	// for (int i = 0; i < n; i++){
	// 	for (int j = 0; j <i; j++){
	// 		if (b[i][j]) {
	// 			cout << j << " " << i << "\n";
	// 		}
	// 	}
	// }
	build(b);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:50:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |    for (int j = 0; j < v.size() - 1; j++){
      |                    ~~^~~~~~~~~~~~~~
supertrees.cpp:63:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |    for (int j = 0; j < v.size(); j++){
      |                    ~~^~~~~~~~~~

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