Submission #651891

#	Time	Username	Problem	Language	Result	Execution time	Memory
651891		coding_snorlax	Connecting Supertrees (IOI20_supertrees)	C++14	0 / 100	1 ms	212 KiB

supertrees

#include "supertrees.h"
#include<bits/stdc++.h>
using namespace std;
int Boss[1005];
int Rank[1005];
int query(int x){
    if(Boss[x]==x) return x;
    else return Boss[x]=query(Boss[x]);
}
int Union(int x,int y){
    int A1=query(x);
    int A2=query(y);
    if(A1==A2){
        return 0;
    }
    if (Rank[A1]>Rank[A2]) Boss[A2]=A1;
    else if(Rank[A1]<Rank[A2]) Boss[A1]=A2;
    else{
        Boss[A2]=A1;
        Rank[A1]++;
    }
    return 1;
}
int construct(vector<vector<int>> x){
    for(int i=0;i<1005;i++){
        Boss[i]=i;
        Rank[i]=0;
    }
    vector<vector<int>> built;
    for(int i=0;i<x.size();i++){
        vector<int> New;
        for(int j=0;j<x.size();j++){
            New.push_back(0);
        }
        built.push_back(New);
    }
    int check=0;
    for(int i=0;i<x.size();i++){
        for(int j=0;j<x.size();j++){
            if (x[i][j]){
                check=Union(i,j);
                /*
                if(check && i!=j){
                    built[i][j]=1;
                    built[j][i]=1;
                    */
                }
            }
        }

    int OK_List[1000]={1};
    int answer=1;
    for(int i=0;i<x.size();i++){
        int now_check=Boss[i];
        vector<int> List1={i};
        if(OK_List[i]){
            OK_List[i]=0;
            for(int j=0;j<x.size();j++){
                if(i!=j && now_check==Boss[j]){
                    List1.push_back(j);
                    OK_List[j]=0;
                }
            }
        }
        List1.push_back(i);
        if(List1.size()>3){
        for(int k=0;k<List1.size()-1;k++){
            built[List1[k]][List1[k+1]]=1;
            built[List1[k+1]][List1[k]]=1;
        }
        }
        else{
            if(List1.size()==1||List1.size()==2) answer=0;
        }
    }
    for(int i=0;i<x.size();i++){
        for(int j=i+1;j<x.size();j++){
            if ((x[i][j] && query(i)!=query(j)) || (!x[i][j] && query(i)==query(j))){
                answer=0;

            }
        }
    }
    if(answer) build(built);
    return answer;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:30:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
supertrees.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for(int j=0;j<x.size();j++){
      |                     ~^~~~~~~~~
supertrees.cpp:38:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
supertrees.cpp:39:22: 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 j=0;j<x.size();j++){
      |                     ~^~~~~~~~~
supertrees.cpp:53:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
supertrees.cpp:58:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |             for(int j=0;j<x.size();j++){
      |                         ~^~~~~~~~~
supertrees.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |         for(int k=0;k<List1.size()-1;k++){
      |                     ~^~~~~~~~~~~~~~~
supertrees.cpp:76:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i=0;i<x.size();i++){
      |                 ~^~~~~~~~~
supertrees.cpp:77:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |         for(int j=i+1;j<x.size();j++){
      |                       ~^~~~~~~~~
supertrees.cpp:37:9: warning: variable 'check' set but not used [-Wunused-but-set-variable]
   37 |     int check=0;
      |         ^~~~~

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