Submission #429384

#	Time	Username	Problem	Language	Result	Execution time	Memory
429384		Dan4Life	슈퍼트리 잇기 (IOI20_supertrees)	C++17	11 / 100	285 ms	27972 KiB

supertrees

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

vector<int> v;
vector<vector<int>> a;
bool vis[1001];
#define pb push_back
int not_tog[1001], tog[1001];
int findSet(int i, int p[]) { return (i==p[i]?i:p[i]=findSet(p[i],p)); }
bool isSameSet(int i, int j, int p[]) { return findSet(i,p)==findSet(j,p); }
void unionSet(int i, int j, int p[])
{
    int x = findSet(i,p), y = findSet(j,p);
    if(x==y)return;
    p[y]=x;
}

int N;
void dfs(int s, int x)
{
    v.pb(s); vis[s]=true;
    for(int i = 0; i < N; i++)
        if(!vis[i] and a[s][i]==x) dfs(i, x);
}

int construct(vector<vector<int>> p) {
    for(auto u : p)
        for(auto v : u)
            if(v==3)return 0;
	N = p.size(), fill(vis,vis+1000,false);
	for(int i = 0; i <= N; i++) tog[i]=not_tog[i]=i;
	for(int i = 0; i < N; i++)
        for(int j = 0; j < N; j++)
            if(i!=j and p[i][j]==0)
                unionSet(i,j,not_tog);
	for(auto u : p)
    {
        vector<int> x; x.clear();
        for(auto v : u) x.pb(v);
        a.pb(x);
    }
	vector<vector<int>> answer;
	vector<int> x; x.clear();
	for(int j = 0; j < N; j++)x.pb(0);
    for(int i = 0; i < N; i++)
        answer.pb(x);
	for(int i =  0; i < N; i++)
    {
        if(vis[i])continue; v.clear();
        dfs(i, 1);
        for(int j = 0; j < v.size()-1; j++)
        {
            answer[v[j]][v[j+1]]=1;
        }
    }
    fill(vis,vis+1000,false);
    for(int i = 0; i < N; i++)
    {
        if(vis[i])continue; v.clear();
        dfs(i, 2); if(v.size()<=1)continue;
        if(v.size()<=2)return 0;
        for(int j = 0; j < v.size(); j++)
        {
            answer[v[j]][v[(j+1)%(int)v.size()]]=1;
        }
    }
    for(int i = 0; i < N; i++)
        for(int j = 0; j < N; j++)
            if(answer[i][j]==1) answer[j][i]=1;
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < N; j++){
            if(i!=j and answer[i][j]==1)
                unionSet(i,j,tog);
        }
    }
    for(int i = 0; i < N; i++)
        for(int j = 0; j < N; j++)
            if(i!=j and isSameSet(i,j,tog) and isSameSet(i,j,not_tog)) return 0;
	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:28:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   28 |     for(auto u : p)
      |     ^~~
supertrees.cpp:31:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   31 |  N = p.size(), fill(vis,vis+1000,false);
      |  ^
supertrees.cpp:46:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   46 |     for(int i = 0; i < N; i++)
      |     ^~~
supertrees.cpp:48:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   48 |  for(int i =  0; i < N; i++)
      |  ^~~
supertrees.cpp:50:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   50 |         if(vis[i])continue; v.clear();
      |         ^~
supertrees.cpp:50:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   50 |         if(vis[i])continue; v.clear();
      |                             ^
supertrees.cpp:52:26: 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 < v.size()-1; j++)
      |                        ~~^~~~~~~~~~~~
supertrees.cpp:60:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   60 |         if(vis[i])continue; v.clear();
      |         ^~
supertrees.cpp:60:29: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   60 |         if(vis[i])continue; v.clear();
      |                             ^
supertrees.cpp:63:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |         for(int j = 0; j < v.size(); j++)
      |                        ~~^~~~~~~~~~
supertrees.cpp:78:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   78 |     for(int i = 0; i < N; i++)
      |     ^~~
supertrees.cpp:81:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   81 |  build(answer);
      |  ^~~~~

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