제출 #348855

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
348855		justiny7	Connecting Supertrees (IOI20_supertrees)	C++14	컴파일 에러	0 ms	0 KiB

supertrees

//#include "supertrees.h"
#include <bits/stdc++.h>
#define eb emplace_back
using namespace std;
using vi=vector<int>;
using vvi=vector<vi>;

const int mxN=1e3+1;
int n, par[mxN], sz[mxN];

int find(int v) {
    return (par[v]==v?v:par[v]=find(par[v]));
}
bool merge(int a, int b) {
    a=find(a), b=find(b);
    if (a==b)
        return 0;
    if (sz[a]>sz[b])
        swap(a, b);
    par[a]=b, sz[b]+=sz[a];
    return 1;
}

int construct(vvi p) {
    n=p.size();
    vvi ans(n, vi(n));
    for (int i=0; i<n; ++i)
        par[i]=i, sz[i]=1;
    for (int i=0; i<n; ++i)
        for (int j=0; j<n; ++j)
            if (p[i][j])
                merge(i, j);
    vector<bool> vis(n);
    vvi grps;
    for (int i=0; i<n; ++i)
        for (int j=0; j<n; ++j)
            if (!p[i][j] && find(i)==find(j))
                return 0;
    for (int i=0; i<n; ++i) {
        if (vis[find(i)])
            continue;
        vi here;
        for (int j=0; j<n; ++j)
            if (find(j)==find(i))
                here.eb(j);
        grps.eb(here);
    }
    for (vi v:grps) {
        int sz=v.size();
        for (int j=0; j<sz; ++j) {
            if (j)
                ans[v[j]][v[j-1]]=ans[v[j-1]][v[j]]=1;
            if (j<sz-1)
                ans[v[j]][v[j+1]]=ans[v[j+1]][v[j]]=1;
        }
    }
    build(ans);
    return 1;
}

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'int construct(vvi)':
supertrees.cpp:57:5: error: 'build' was not declared in this scope
   57 |     build(ans);
      |     ^~~~~