Submission #318594

#	Time	Username	Problem	Language	Result	Execution time	Memory
318594		NintsiChkhaidze	Connecting Supertrees (IOI20_supertrees)	C++14	100 / 100	265 ms	22376 KiB

supertrees

#include "supertrees.h"
#include <iostream>
#include <vector>
#define pb push_back
using namespace std;
vector<vector<int>> answer;
vector <int> row,cycle,vec[1005];
int par[4][1005];
bool f[1005];
int construct(vector<vector<int>> p) {
    int n = p.size(),a=0,b=0;
    for(int i=0;i<n;i++){
        row.clear();
        for (int j=0;j<n;j++){
            if (p[i][j] == 3) return 0;
            if (p[i][i] != 1) return 0;
            row.pb(0);
        }
        answer.pb(row);
    }
    for(int i=0;i<n;i++)
        par[1][i]=i,par[2][i]=i;
    
    for (int i=0;i<n;i++){
        if (f[i]) continue;
        for (int j=0;j<n;j++){
            if (p[i][j] == 1 && i!=j){
                f[j]=1;
                par[1][j] = i;
                vec[i].pb(j);
                answer[i][j]=answer[j][i]=1;
            }
        }
    }
    
    for (int i=0;i<n;i++)
        for (int j=i+1;j<n;j++)
            if (par[1][i] == par[1][j] && p[i][j]!=1) return 0;
    
    for(int i=0;i<n;i++) f[i]=0;
    for(int i=0;i<n;i++){
        if (f[i]) continue;
        cycle.clear();
        cycle.pb(i);
        int cur = i;
        for (int j=0;j<n;j++){
            if (i==j) continue;
            if (p[i][j] == 2 && !f[j]) {
                cycle.pb(j);
                for (int z=0;z<vec[j].size();z++)
                    f[vec[j][z]] = 1,par[2][vec[j][z]] = i;
                f[j]=1,par[2][j] = i;
                answer[j][cur] = answer[cur][j] = 1;
                cur = j;
            }            
        }
        if (cycle.size() == 1) continue;
        if (cycle.size() == 2) return 0;
        for (int z=0;z<vec[i].size();z++)
            f[vec[i][z]] = 1,par[2][vec[i][z]] = i;
        
        answer[i][cur] = answer[cur][i] = 1;
    }
    for (int i=0;i<n;i++)
        for (int j=i+1;j<n;j++){
             if (par[1][i]!=par[1][j] && par[2][i] == par[2][j] && p[i][j]!=2) return 0;
             if (par[1][i]!=par[1][j] && par[2][i]!=par[2][j] && p[i][j]!=0) return 0;
        }
           
    
    build(answer);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:50:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |                 for (int z=0;z<vec[j].size();z++)
      |                              ~^~~~~~~~~~~~~~
supertrees.cpp:59:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         for (int z=0;z<vec[i].size();z++)
      |                      ~^~~~~~~~~~~~~~
supertrees.cpp:11:22: warning: unused variable 'a' [-Wunused-variable]
   11 |     int n = p.size(),a=0,b=0;
      |                      ^
supertrees.cpp:11:26: warning: unused variable 'b' [-Wunused-variable]
   11 |     int n = p.size(),a=0,b=0;
      |                          ^

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