Submission #302886

#	Time	Username	Problem	Language	Result	Execution time	Memory
302886		8e7	Connecting Supertrees (IOI20_supertrees)	C++14	21 / 100	267 ms	22264 KiB

supertrees

//Challenge: Accepted
#include "supertrees.h"
#include <vector>
#include <iostream>
#define maxn 1005
using namespace std;
int par[maxn];
vector<int> group[maxn];
int getpar(int a) {
	return a == par[a] ? a : par[a] = getpar(par[a]);
}
void combine(int a, int b) {
	par[getpar(a)] = getpar(b);
}
int construct(vector<vector<int> > p) {
	int n = p.size();
	for (int i = 0;i < n;i++) par[i] = i;
	for (int i = 0;i < n;i++) {
		for (int j = i + 1;j < n;j++) {
			if (p[i][j]) {
				combine(i, j);
			}
		}
	}
	for (int i = 0;i < n;i++) {
		par[i] = getpar(i);
		group[par[i]].push_back(i);
	}
	vector<vector<int> > ans;
	for (int i = 0;i < n;i++) {
		vector<int> add(n, 0);
		ans.push_back(add);
	}
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < group[i].size();j++) {
			for (int k = j + 1;k < group[i].size();k++) {
				if (p[group[i][j]][group[i][k]] == 0) {
					return 0;
				}
			}
			if (j) {
				ans[group[i][j - 1]][group[i][j]] = ans[group[i][j]][group[i][j - 1]] = 1;
			}
		}
	}
	/*
	for (int i = 0;i < n;i++) {
		for (int j = 0;j < n;j++) {
			cout << ans[i][j] << " ";
		}
		cout << endl;
	}
	*/
	build(ans);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:35:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   for (int j = 0;j < group[i].size();j++) {
      |                  ~~^~~~~~~~~~~~~~~~~
supertrees.cpp:36:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |    for (int k = j + 1;k < group[i].size();k++) {
      |                       ~~^~~~~~~~~~~~~~~~~

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