Submission #302199

#	Time	Username	Problem	Language	Result	Execution time	Memory
302199		aymane7	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include<bits/stdc++.h>
//#include"supertrees.h"
#pragma GCC optimize("O2")
#define S second
#define F first
#define PB push_back
#define sz(x) (int) x.size()
#define all(x) x.begin(),x.end()
#define L(x) 2*x
#define R(x) 2*x+1
#define M(x,y) (x+y)/2
using namespace std;
typedef long long ll;
const int N=1e3+1;
int p[N],lvl[N];
int getp(int x){
    return (p[x]==x)? x : p[x]=getp(p[x]);
}
void unite(int i,int j){
    int x=getp(i),y=getp(j);
    if(x==y)
        return ;
    if(lvl[x]>lvl[y])
        swap(x,y);
    p[x]=y;
    if(lvl[x]==lvl[y])
        lvl[y]++;
}
void build(vector<vector<int>> t){
    for(auto v:t){
        for(auto x:v)
            cout<<x<<" ";
        cout<<endl;
    }
}
int construct(vector<vector<int>> b){
    int n=sz(b);
    vector<vector<int>> ans(n,vector<int>(n,0));
    for(int i=0;i<n;i++){
        lvl[i]=0;
        p[i]=i;
    }
    int type=1;
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++){
            if(b[i][j]==2)
                unite(i,j);
        }

    vector<int> co[n];
    for(int i=0;i<n;i++)
        co[getp(i)].PB(i);

    for(int i=0;i<n;i++){
        if(sz(co[i])<=1)
            continue;
        if(sz(co[i])==2){
            return 0;
        }
        for(int j=0;j<sz(co[i])-1;j++)
            ans[co[i][j]][co[i][j+1]]=1,ans[co[i][j+1]][co[i][j]]=1;
        ans[co[i][0]][co[i].back()]=1,ans[co[i].back()][co[i][0]]=1;
        for(auto x:co[i])
        for(auto y:co[i]){
            if(x==y)
                continue;
            if(b[x][y]==0)
                return 0;
        }
    }
    build(ans);
    return 1;
}

int main(){
    int n;
    cin>>n;
    vector<vector<int>> t(n,vector<int>(n,0));
    for(int i=0;i<n;i++)
        for(int j=0;j<n;j++)
            cin>>t[i][j];
    construct(t);
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:43:9: warning: unused variable 'type' [-Wunused-variable]
   43 |     int type=1;
      |         ^~~~
/tmp/ccXquAsa.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/ccO7wZxd.o:supertrees.cpp:(.text.startup+0x0): first defined here
/tmp/ccXquAsa.o: In function `build(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)':
grader.cpp:(.text+0x110): multiple definition of `build(std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
/tmp/ccO7wZxd.o:supertrees.cpp:(.text+0xc0): first defined here
collect2: error: ld returned 1 exit status