Submission #953762

#	Time	Username	Problem	Language	Result	Execution time	Memory
953762		Trisanu_Das	Connecting Supertrees (IOI20_supertrees)	C++17	46 / 100	175 ms	24148 KiB

supertrees

#include "supertrees.h"
#include <vector>
 
using namespace std;
 
int par[1005];
 
int fi(int i){
    if(par[i]==i)
        return i;
    else
        return par[i]=fi(par[i]);
}
 
void un(int i,int j){
    par[fi(j)]=fi(i);
}
 
int construct(vector<vector<int>> p) {
	int n = p.size();
	vector<vector<int>> ans;
	for (int i = 0; i < n; i++) {
		vector<int> row;
		row.resize(n);
		ans.push_back(row);
	}
 
	for(int i=0;i<n;i++)
        par[i]=i;
 
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            if(p[i][j]==1&&fi(i)!=fi(j)){
                ans[i][j]=ans[j][i]=1;
                un(i,j);
            }
            if(p[i][j]==3||(p[i][j]==0&&fi(i)==fi(j)))
                return 0;
        }
    }
 
    for(int i=0;i<n;i++){
        vector<int> v;
        v.push_back(par[i]);
 
        for(int j=i+1;j<n;j++){
            if(p[i][j]==2&&fi(i)!=fi(j)){
                v.push_back(par[j]);
                un(i,j);
            }
        }
 
        if(v.size()==2)
            return 0;
 
        for(int k=0;k+1<v.size();k++)
            ans[v[k]][v[k+1]]=ans[v[k+1]][v[k]]=1;
        ans[v[0]][v[v.size()-1]]=ans[v[v.size()-1]][v[0]]=1;
 
    }
 
    for(int i=0;i<n;i++)
        ans[i][i]=0;
 
	build(ans);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:56:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |         for(int k=0;k+1<v.size();k++)
      |                     ~~~^~~~~~~~~
supertrees.cpp:62:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   62 |     for(int i=0;i<n;i++)
      |     ^~~
supertrees.cpp:65:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   65 |  build(ans);
      |  ^~~~~

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