제출 #429322

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
429322		pere_gil	슈퍼트리 잇기 (IOI20_supertrees)	C++14	0 / 100	1 ms	204 KiB

supertrees

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

int p[1005];

void init(int n){
	for(int i=0;i<n;i++) p[i]=i;
}

int find_set(int n){
	return (p[n]==n) ? n : p[n]=find_set(p[n]);
}

bool same_set(int a, int b){
	return find_set(a)==find_set(b);
}

void union_set(int a, int b){
	if(!same_set(a,b)) p[find_set(a)]=find_set(b);
}

void form_group(vector<int> &g, vector<vector<int> > &v){
	for(int i=0;i<g.size();i++){
		int j=(i+1)%g.size();
		v[g[i]][g[j]]=v[g[j]][g[i]]=1;
	}
}

int construct(vector<vector<int> > v){
	int n=v.size();
	init(n);
	
	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
			if(v[i][j]==2) union_set(i,j);

	vector<vector<int> > g(n);
	for(int i=0;i<n;i++)
		g[find_set(i)].push_back(i);

	/*
	printf("Groups are:\n");
	for(int i=0;i<n;i++){
		if(g[i].size()==0) continue;
		printf("%d: ",i);
		for(int j=0;j<g[i].size();j++) printf("%d ",g[i][j]);
		printf("\n");
	}
	*/

	for(int i=0;i<n;i++)
		for(int j=0;j<n;j++)
			if(same_set(i,j) && v[i][j]==0) return 0;

	vector<vector<int> > ans(n,vector<int> (n,0));
	for(int i=0;i<n;i++)
		form_group(g[i],ans);
	build(ans);
	
	return 1;
}

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'void form_group(std::vector<int>&, std::vector<std::vector<int> >&)':
supertrees.cpp:24:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |  for(int i=0;i<g.size();i++){
      |              ~^~~~~~~~~

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