Submission #1073407

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073407		blushingecchigirl	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

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

#define ll long long
#define ull unsigned long long
#define pb push_back


struct dsu {
    vector<int> parent, rank;
    int size;

    dsu(int sz) {
        size = sz;
        rank.assign(size, 1);
        parent.resize(size);
        for(int i = 0; i<size; i++) parent[i] = i;
    }
    int search(int v) {
        if(v == parent[v]) return v;
        return parent[v] = search(parent[v]);
    }
    void connect(int v, int u) {
        v = search(v);
        u = search(u);
        if(v == u) return;
        if(rank[v]>=rank[u]) parent[u] = v;
        else parent[v] = u;
        if(rank[v] == rank[u]) rank[v]++;
        return;
    }
};

void solve() {
    int n;
    cin>>n;
    int p[n][n]{};
    bool construct = 1, b[n][n]{};
    
    vector<int> a[n];
    dsu d = dsu(n);
    for(int i = 0; i<n; i++) {
        for(int j = 0; j<n; j++) {
            cin>>p[i][j];
            if(p[i][j]) d.connect(i, j);
        }
    }
    for(int i = 0; i<n; i++) {
        a[d.search(i)].pb(i);
    }
    for(int i = 0; i<n; i++) {
        if(a[i].size()<=1) continue;
        int pth = p[a[i][0]][a[i][1]];
        for(int ii:a[i]) {
            for(int j:a[i]) {
                if(ii == j) continue;
                if(p[ii][j] != pth) construct = false;
            }
        }
        for(size_t ii = 1; ii<a[i].size(); ii++) {
            b[ii][ii-1] = b[ii-1][ii] = 1;
        }
        if(pth == 2) b[a[i][0]][a[i].back()] = b[a[i].back()][a[i][0]] = 1;
    }
    cout << construct << '\n';
    if(construct) {
        for(int i = 0; i<n; i++) {
            for(int j = 0; j<n; j++) cout << b[i][j] << ' ';
            cout << '\n';
        }
    }
    
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    int t = 1;
    // cin>>t;
    while(t--)
    solve();
    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccaHCTZK.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc7rodOM.o:supertrees.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccaHCTZK.o: in function `main':
grader.cpp:(.text.startup+0x39a): undefined reference to `construct(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
collect2: error: ld returned 1 exit status