Submission #347875

#	Time	Username	Problem	Language	Result	Execution time	Memory
347875		evn	Connecting Supertrees (IOI20_supertrees)	C++14	Compilation error	0 ms	0 KiB

supertrees

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define sz(a) a.size()
typedef long long ll;
typedef pair<int, int> pii;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class T> using oset=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
int N;
int construct(vector<vector<int>> p){
	N = p.size();
	bool c1 = false;
	bool c2 = false;
	bool c3 = false;
	for(int i = 0; i < N; i++){
		for(int j = 0;j  < N; j++){
			if(p[i][j] == 1)c1 = true;
			if(p[i][j] == 2)c2 = true;
			if(p[i][j] == 3)c3 = true;
		}
	}
	if(c1 && !c2 && !c3){
		//tree case
		vector<vector<int>> b;
		for(int i = 0; i < N;i ++){
			int c1 = 2*i + 1;
			int c2 = 2*i + 2;
			int p = (i-1)/2;
			vector<int> curr;
			for(int j = 0;j  < N; j++){
				if(j == p || j == c1 || j== c2){
					curr.pb(1);
				}
				else{
					curr.pb(0);
				}
			}
			b.pb(curr);
		}
		build(b);
		return 1;
	}
}
int main(){

	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	


}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:45:3: error: 'build' was not declared in this scope
   45 |   build(b);
      |   ^~~~~
supertrees.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type]
   48 | }
      | ^