Submission #1029353

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029353		elpro123	Connecting Supertrees (IOI20_supertrees)	C++14	46 / 100	130 ms	31920 KiB

supertrees

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

int p[1000][1000],ans[1000][1000];

void add(int v,int u){
	ans[v][u] = ans[u][v] = 1;
}

int construct(vector<vector<int>> P){
	int n = P.size();
	for(int i=0; i<n; i++){
		for(int j=0; j<n; j++){
			p[i][j] = P[i][j];
			if(p[i][j] == 3){
				return 0;
			}
		}
	}
	//find all nodes connected to 1
	//then nodes with p(1,v) = 1
	//this has to form a tree
	//repeat forming many trees then link the trees in a cycle
	vector<int> ded(n,0);
	for(int i=0; i<n; i++){
		if(ded[i]){
			continue;
		}
		vector<int> comp;
		vector<bool> incomp(n,0);
		for(int j=0; j<n; j++){
			if(ded[j]){
				continue;
			}
			if(p[i][j]){
				incomp[j] = 1;
				comp.push_back(j);
				ded[j] = 1;
			}
		}
		vector<vector<int>> trees;
		while(!comp.empty()){
			int v = comp[0];
			vector<int> tree,tmp;
			for(int u: comp){
				if(p[u][v] == 1){
					tree.push_back(u);
				}else{
					tmp.push_back(u);
				}
			}
			trees.push_back(tree);
			comp = tmp;
		}
		int ss = trees.size();
		if(ss > 1){
			add(trees[0][0], trees[ss-1][0]);
		}
		for(int i=0; i<ss; i++){
			if(i+1<trees.size()){
				add(trees[i][0],trees[i+1][0]);
			}
			for(int j=0; j+1<trees[i].size(); j++){
				add(trees[i][j],trees[i][j+1]);
			}
		}
 
	}
	vector<vector<int>> fin(n);
	for(int i=0; i<n; i++){
		fin[i].assign(n,0);
		for(int j=0; j<n; j++){
			fin[i][j] = ans[i][j];
		}
	}
	build(fin);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:61:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |    if(i+1<trees.size()){
      |       ~~~^~~~~~~~~~~~~
supertrees.cpp:64:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |    for(int j=0; j+1<trees[i].size(); j++){
      |                 ~~~^~~~~~~~~~~~~~~~

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