제출 #366899

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
366899		rumen_m	슈퍼트리 잇기 (IOI20_supertrees)	C++17	0 / 100	3 ms	620 KiB

supertrees

#include "supertrees.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1005;
vector <vector <int> > g;
vector <vector <int> > ones;
short id[maxn], ids = 0;
bool vis[maxn];
vector <vector <int> > groups;
//short ans[maxn][maxn];
vector <vector <int> > ans;
short newids[maxn];
void dfs(int v)
{
    id[v]=ids;
    int i;
    for(i=0;i<g[v].size();i++)
    {
        if(id[g[v][i]]==0)dfs(g[v][i]);
    }
}
void solve(int v)
{
    newids[v] = ids;
    vis[v] = 1;
    int i;
    for(i=0;i<ones[v].size();i++)
    {
        if(!vis[ones[v][i]])
        {
            ans[v][ones[v][i]] = 1;
            solve(ones[v][i]);
        }
    }
}
int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	ans.resize(n);
    g.resize(n);
    ones.resize(n);
    groups.resize(n);
	int i,j,t;
	for(i=0;i<n;i++)
        ans[i].resize(n);
	for(i=0;i<n;i++)
        for(j=0;j<n;j++)
    {
        if(i==j)continue;
        if(p[i][j]==3)return 0;
        if(p[i][j]>0)
        {
           /* for(t=0;t<n;t++)
            {
                 if((p[i][t]>0)^(p[j][t]>0)==1)return 0;
                 if(p[i][j]==1)
                    if(p[i][t]==1^p[j][t]==1)return 0;
            }*/

        }
        if(p[i][j]!=0)
        {
            g[i].push_back(j);
            g[j].push_back(i);
        }
        if(p[i][j]==1)
        {
            ones[i].push_back(j);
            ones[j].push_back(i);
        }
    }
    for(i=0;i<n;i++)
    {
        if(id[i]==0){ids++;dfs(i);}
    }
    for(i=0;i<n;i++)
    {
        if(!vis[i])
        {
            groups[id[i]].push_back(i);
            ids++;
            solve(i);
        }
    }
    for(i=1;i<=ids;i++)
    {
        if(groups[i].size()==2)return 0;
        if(groups[i].size()<=2)continue;
        ans[groups[i][0]][groups[i][groups[i].size()-1]] = 1;
        for(j=1;j<groups[i].size();j++)
        {
            ans[groups[i][j-1]][groups[i][j]] = 1;
        }
    }
	///std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		//std::vector<int> row;
		//row.resize(n);
		for(j=0;j<n;j++)
        {
           // row[j] = ans[i][j]|ans[j][i];
           ans[i][j] = ans[i][j]|ans[j][i];
            if(i==j)continue;
            if(p[i][j]==0&&id[i]==id[j]){return 0;}
            if(p[i][j]==1&&newids[i]!=newids[j])return 0;
        }

		//answer.push_back(row);
	}
	build(ans);
	return 1;
}

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'void dfs(int)':
supertrees.cpp:18:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for(i=0;i<g[v].size();i++)
      |             ~^~~~~~~~~~~~
supertrees.cpp: In function 'void solve(int)':
supertrees.cpp:28:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(i=0;i<ones[v].size();i++)
      |             ~^~~~~~~~~~~~~~~
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:90:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |         for(j=1;j<groups[i].size();j++)
      |                 ~^~~~~~~~~~~~~~~~~
supertrees.cpp:43:10: warning: unused variable 't' [-Wunused-variable]
   43 |  int i,j,t;
      |          ^

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