Submission #301782

#	Time	Username	Problem	Language	Result	Execution time	Memory
301782		Pro100Yan	Connecting Supertrees (IOI20_supertrees)	C++14	Compilation error	0 ms	0 KiB

supertrees

#include "supertrees.h"
#include <vector>
#include <iostream>
#define ll long long
#define pb push_back

using namespace std;
const int N = 2005;
vector<vector<int>> ans;

int get_parent(int v){
    if(v == d[v])
      	return v;
    return d[v] = get_parent(d[v]);
}

void add(int u, int v){
    int f = get_parent(u), s = get_parent(v);
    if(f != s)
        d[f] = d[s];
}



int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	int fault = 0;
	for(int i = 0; i < n; i++)
        d[i] = i;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		ans.push_back(row);
	}

    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            if(p[i][j]){
                add(i, j);
            }
        }
    }
    int pi, pj;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            pi = get_parent(i);
            pj = get_parent(j);
        }
        if(p[i][j]){
            if(pi != pj)
                return 0;
            ans[i][pi] = ans[pi][i] = 1;
            ans[j][pi] = ans[pi][j] = 1;
        }
        else{
            if(pi == pj)
                return 0;
        }
    }

	build(ans);
	return 1;
}
/*
5
1 0 0 1 1
0 1 1 0 0
0 1 1 0 0
1 0 0 1 1
1 0 0 1 1
*/

Compilation message (stderr)

supertrees.cpp: In function 'int get_parent(int)':
supertrees.cpp:13:13: error: 'd' was not declared in this scope
   13 |     if(v == d[v])
      |             ^
supertrees.cpp:15:12: error: 'd' was not declared in this scope
   15 |     return d[v] = get_parent(d[v]);
      |            ^
supertrees.cpp: In function 'void add(int, int)':
supertrees.cpp:21:9: error: 'd' was not declared in this scope
   21 |         d[f] = d[s];
      |         ^
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:30:9: error: 'd' was not declared in this scope
   30 |         d[i] = i;
      |         ^
supertrees.cpp:50:17: error: 'j' was not declared in this scope
   50 |         if(p[i][j]){
      |                 ^
supertrees.cpp:28:6: warning: unused variable 'fault' [-Wunused-variable]
   28 |  int fault = 0;
      |      ^~~~~