Submission #524627

#	Time	Username	Problem	Language	Result	Execution time	Memory
524627		byunjaewoo	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include <bits/stdc++.h>
using namespace std;
using ll=long long;

const int Nmax=1010;
int N, A[Nmax][Nmax];
int G[Nmax], cnt, P[Nmax], dist[Nmax];
bool ans[Nmax][Nmax], chk[Nmax];
vector<int> nodes, V[Nmax], adj[Nmax], adj2[Nmax];

int Find(int x) {return G[x]?G[x]=Find(G[x]):x;}
void Union(int x, int y) {
    x=Find(x), y=Find(y);
    if(x==y) return;
    G[x]=y;
}

void DFS(int curr) {
    nodes.push_back(curr);
    for(int next:adj[curr]) if(!P[next]) {
        ans[curr-1][next-1]=ans[next-1][curr-1]=1;
        P[next]=cnt;
        DFS(next);
    }
}

void DFS2(int curr) {
    for(int next:adj[curr]) if(!chk[next]) {
        chk[next]=1;
        dist[next]++;
        DFS2(next);
        chk[next]=0;
    }
}

int construct(vector<vector<int>> p) {
    N=p.size();
    for(int i=1; i<=N; i++) for(int j=1; j<=N; j++) {
        A[i][j]=p[i-1][j-1];
        if(A[i][j]==3) {cerr<<0; return 0;}
    }
    for(int i=1; i<=N; i++) {
        for(int j=1; j<i; j++) if(A[i][j]) Union(i, j);
    }
    for(int i=1; i<=N; i++) {
        for(int j=1; j<i; j++) if(!A[i][j] && Find(i)==Find(j)) return 0;
    }
    for(int i=1; i<=N; i++) V[Find(i)].push_back(i);
    for(int i=1; i<=N; i++) {
        if(V[i].empty()) continue;
        for(int j:V[i]) for(int k:V[i]) if(j!=k && A[j][k]==1) {
            adj[j].push_back(k);
        }
        vector<int> tmp;
        for(int j:V[i]) if(!P[j]) {
            nodes.clear();
            P[j]=++cnt;
            DFS(j);
            for(int k:nodes) for(int l:nodes) if(A[k][l]==2) return 0;
            tmp.push_back(j);
        }
        if(tmp.size()==2) return 0;
        for(int j=0; j<(int)tmp.size()-1; j++) ans[tmp[j]-1][tmp[j+1]-1]=ans[tmp[j+1]-1][tmp[j]-1]=1;
        if(tmp.size()>1) ans[tmp.back()-1][tmp[0]-1]=ans[tmp[0]-1][tmp.back()-1]=1;
    }
    build(ans);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:66:5: error: 'build' was not declared in this scope
   66 |     build(ans);
      |     ^~~~~