Submission #304472

#	Time	Username	Problem	Language	Result	Execution time	Memory
304472		Leonardo_Paes	Connecting Supertrees (IOI20_supertrees)	C++17	21 / 100	258 ms	22264 KiB

supertrees

#include "supertrees.h"
#include <vector>
using namespace std;
const int maxn = 1e3+10;
int pai[maxn], sz[maxn];
int find(int x){ return pai[x] = (pai[x] == x ? x : find(pai[x])); }
void join(int a, int b){
    a = find(a), b = find(b);
    if(a == b) return;
    if(sz[a] > sz[b]) swap(a, b);
    sz[b] += sz[a];
    pai[a] = b;
}
int construct(vector<vector<int> > p) {
	int n = p.size();
	vector<vector<int> > ans;
	for(int i=0; i<n; i++){
        vector<int> row;
        for(int j=0; j<n; j++){
            row.push_back(0);
        }
        ans.push_back(row);
	}
    for(int i=0; i<n; i++){
        pai[i] = i;
        sz[i] = 1;
    }
    for(int i=0; i<n; i++){
        for(int j=i+1; j<n; j++){
            if(p[i][j]) join(i, j);
        }
    }
    bool ok = 1;
    for(int i=0; i<n; i++){
        for(int j=i+1; j<n; j++){
            if(p[i][j] == 0){
                if(find(i) == find(j)) ok = 0;
            }
        }
    }
    if(!ok) return 0;
    for(int i=0; i<n; i++){
        int j = find(i);
        if(i != j) ans[i][j] = ans[j][i] = 1;
    }
    build(ans);
	return 1;
}

• Subtask 1: 11 / 11
• Subtask 2: 10 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4