Submission #302291

#	Time	Username	Problem	Language	Result	Execution time	Memory
302291		grt	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include <bits/stdc++.h>
#define PB push_back
#define ST first
#define ND second
#define _ ios_base::sync_with_stdio(0); cin.tie(0);
//mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

using namespace std;

using ll = long long;
using pi = pair<int,int>;
using vi = vector<int>;

const int nax = 1000 + 10;
int n;
vi V1[nax], V2[nax];
bool done1[nax], done2[nax];
vi act = {}, cyc = {};
bool ont[nax];
vector<vi>g;
vector<vi>tmp;

void dfs1(int x) {
	done1[x] = 1;
	act.PB(x);
	for(int nbh : V1[x]) if(!done1[nbh]) {
		dfs1(nbh);
	}
}

void dfs2(int x) {
	done2[x] = 1;
	act.PB(x);
	for(int nbh : V2[x]) if(ont[nbh] && !done2[nbh]) {
		dfs2(nbh);
	}
}

int construct(vector<vi>p) {
	n = (int)p.size();
	g.resize(n);
	for(int i = 0; i < n; ++i) {
		g[i].resize(n);
		for(int j = 0; j < n; ++j) {
			if(p[i][j] == 3) {
				return 0;
			}
			if(p[i][j] == 1) {
				V1[i].PB(j);
				V1[j].PB(i);
			} else if(p[i][j] == 2) {
				V2[i].PB(j);
				V2[j].PB(i);
			}
		}
	}
	for(int i = 0; i < n; ++i) {
		if(!done1[i]) {
			act = {};
			dfs1(i);
			ont[i] = 1;
			tmp.PB(act);
			for(int x : act) {
				for(int y : act) {
					if(p[x][y] != 1) return 0;
				}
			}
			cyc.PB(i);
			int a = i;
			for(int x : act) {
				if(x != a) {
					g[x][a] = g[a][x] = 1;
				}
			}
		}
	}
	for(int x : cyc) {
		if(!done2[x]) {
			act = {};
			dfs2(x);
			if((int)act.size() ==1 ) continue;
			for(int x1 : act) {
				for(int y : act) {
					if(x1 != y) {
						if(p[x1][y] != 2) {
							return 0;
						}
					}
				}
			}
			for(int j = 1; j < (int)act.size(); ++j) {
				g[act[j]][act[j - 1]] = g[act[j - 1]][act[j]] = 1;
			}
			g[act[0]][act.back()] = g[act.back()][act[0]] = 1;
		}
	}
	//~ for(int i = 0; i < n; ++i) {
		//~ cout << ont[i] << " ";
		//~ for(int j = 0; j < n; ++j) {
			//~ cout << g[i][j] << " ";
		//~ }
		//~ cout << "\n";
	//~ }	
	build(g);
			
		
			
	return 1;
}
	
	

//~ int main() {
	//~ cout << construct({{1, 1, 2, 2}, {1, 1, 2, 2}, {2, 2, 1, 2}, {2, 2, 2, 1}});
//~ }

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:104:2: error: 'build' was not declared in this scope
  104 |  build(g);
      |  ^~~~~