답안 #432346

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
432346	2021-06-18T08:25:12 Z	arayi	슈퍼트리 잇기 (IOI20_supertrees)	C++17	컴파일 오류	0 ms	0 KB

supertrees

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

const int N = 1111;
int col[N], sm[N], i1 = 1;
vector <vector <int> > b;
vector<int> g[N];
int n;
void dfs(int v)
{
	col[v] = 2;
	sm[v]++;
	for(auto p : g[v])
		if(col[i] != 2 && b[v][i]) dfs(i);
	col[v] = 1;
}
int construct(std::vector<std::vector<int>> p) {
	n = p.size();
	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			if(p[i][j] > 3) return 0;
	for (int i = 0; i < n; i++)
	{
		if(sm[i])
		{
			for (int j = 0; j < n; j++)
			{
				if(p[i][j] && sm[i] != sm[j]) return 0;
				if(p[i][j] == 0 && sm[i] == sm[j]) return 0;
			}
		}
		else
		{
			for (int j = 0; j < n; j++)
			{
				if(p[i][j] && sm[j]) return 0;
				if(p[i][j]) sm[j] = i1;
			}
		}
		i1++;
	}
	b.resize(n);
	for (int i = 0; i < n; i++) b[i].resize(n);
	for (int i = 1; i < i1; i++)
	{
		vector<int> fp;
		for (int j = 0; j < n; j++)
			if(sm[j] == i) fp.ad(j);
		int nx = -1;
		for (int j = 0; j < fp.size(); j++)
		{
			if(col[fp[j]]) continue;
			if(nx != -1) b[nx][fp[j]] = b[fp[j]][nx] = 1;
			nx = fp[j];
			col[fp[j]] = 1;
			for (int k = j + 1; k < fp.size(); k++)
				if(p[fp[j]][fp[k]] == 1) b[fp[j]][fp[k]] = b[fp[k]][fp[j]] = 1, col[fp[k]] = 1;
		}		
		if(nx != -1 && nx != fp[0]) b[nx][fp[0]] = b[fp[0]][nx] = 1;
	}
	for (int i = 0; i < n; i++)
		for (int j = 0; j < n; j++)
			if(b[i][j]) g[i].ad(j);
	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n; j++) sm[j] = col[j] = 0;
		dfs(i);
		for (int j = 0; j < n; j++) if(sm[j] != p[i][j]) return 0;
	}
	build(b);
	return 1;
}

Compilation message

supertrees.cpp: In function 'void dfs(int)':
supertrees.cpp:16:10: error: 'i' was not declared in this scope
   16 |   if(col[i] != 2 && b[v][i]) dfs(i);
      |          ^
supertrees.cpp:15:11: warning: unused variable 'p' [-Wunused-variable]
   15 |  for(auto p : g[v])
      |           ^
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:52:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   for (int j = 0; j < fp.size(); j++)
      |                   ~~^~~~~~~~~~~
supertrees.cpp:58:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |    for (int k = j + 1; k < fp.size(); k++)
      |                        ~~^~~~~~~~~~~