Submission #308997

#	Time	Username	Problem	Language	Result	Execution time	Memory
308997		tjdgus4384	Connecting Supertrees (IOI20_supertrees)	C++14	46 / 100	268 ms	30200 KiB

supertrees

#include<bits/stdc++.h>
#include "supertrees.h"
using namespace std;
vector<int> graph[1001], trees[1001];
vector<vector<int> > b, P;
vector<int> v[1001];
bool visited[1001];

void dfs(int x, int cnt){
    graph[cnt].push_back(x);
    for(int i = 0;i < v[x].size();i++){
        if(visited[v[x][i]]) continue;
        visited[v[x][i]] = true;
        dfs(v[x][i], cnt);
    }
}

void make_tree(int x){
    for(int i = 0;i < v[x].size();i++){
        if(visited[v[x][i]]) continue;
        if(P[x][v[x][i]] != 1) continue;
        visited[v[x][i]] = true;
        make_tree(v[x][i]);
        b[x][v[x][i]] = 1;
        b[v[x][i]][x] = 1;
    }
}
int construct(vector<vector<int> > p){
    P = p;
    b.resize(p.size());
    for(int i = 0;i < p.size();i++){
        b[i].resize(p.size());
        for(int j = 0;j < p.size();j++){
            if(i == j) continue;
            if(p[i][j]) v[i].push_back(j);
        }
    }
    int cnt = 0;
    for(int i = 0;i < p.size();i++){
        if(visited[i]) continue;
        visited[i] = true;
        dfs(i, cnt); cnt++;
    }
    for(int i = 0;i < p.size();i++) visited[i] = false;
    for(int i = 0;i < cnt;i++){
        vector<int> nv;
        for(int j = 0;j < graph[i].size();j++){
            if(visited[graph[i][j]]) continue;
            visited[graph[i][j]] = true;
            make_tree(graph[i][j]);
            nv.push_back(graph[i][j]);
        }
        if(nv.size() <= 1) continue;
        for(int j = 0;j < nv.size() - 1;j++){
            b[nv[j]][nv[j+1]] = 1;
            b[nv[j+1]][nv[j]] = 1;
        }
        b[nv[0]][nv.back()] = 1;
        b[nv.back()][nv[0]] = 1;
        if(p[nv[0]][nv[1]] == 3 && nv.size() >= 4){
            b[nv[0]][nv[2]] = b[nv[2]][nv[0]] = 1;
        }
    }
    build(b);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'void dfs(int, int)':
supertrees.cpp:11:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for(int i = 0;i < v[x].size();i++){
      |                   ~~^~~~~~~~~~~~~
supertrees.cpp: In function 'void make_tree(int)':
supertrees.cpp:19:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i = 0;i < v[x].size();i++){
      |                   ~~^~~~~~~~~~~~~
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:31:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int i = 0;i < p.size();i++){
      |                   ~~^~~~~~~~~~
supertrees.cpp:33:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for(int j = 0;j < p.size();j++){
      |                       ~~^~~~~~~~~~
supertrees.cpp:39:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for(int i = 0;i < p.size();i++){
      |                   ~~^~~~~~~~~~
supertrees.cpp:44:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i = 0;i < p.size();i++) visited[i] = false;
      |                   ~~^~~~~~~~~~
supertrees.cpp:47:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int j = 0;j < graph[i].size();j++){
      |                       ~~^~~~~~~~~~~~~~~~~
supertrees.cpp:54:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         for(int j = 0;j < nv.size() - 1;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