Submission #303487

#	Time	Username	Problem	Language	Result	Execution time	Memory
303487		Jarif_Rahman	Connecting Supertrees (IOI20_supertrees)	C++17	11 / 100	247 ms	24824 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;
vector<vector<int>> v;
vector <vector<int>> dsu1;
vector <int> dsu2;
void unite(int a, int b){
    if(dsu2[a] == dsu2[b]) return;
    int x = dsu2[a], y = dsu2[b];
    if(dsu1[x].size() < dsu1.size()){
        while(!dsu1[x].empty()){
            int ss = dsu1[x].back();
            dsu1[x].pop_back();
            dsu2[ss] = y;
            dsu1[y].pb(ss);
        }
    }
    else{
        while(!dsu1[y].empty()){
            int ss = dsu1[y].back();
            dsu1[y].pop_back();
            dsu2[ss] = x;
            dsu1[x].pb(ss);
        }
    }
}
int construct(vector<vector<int>> p){
    v.clear();
    dsu1.clear();
    dsu2.clear();
    int n = p.size();
    v = vector<vector<int>>(n, vector<int>(n, 0));
    dsu1 = vector<vector<int>>(n);
    dsu2 = vector<int>(n);
    for(int i = 0; i < n ; i++) dsu1[i].pb(i);
    for(int i = 0; i < n; i++) dsu2[i] = i;
    for(int i = 0; i < n; i++) for(int j = 0; j < n; j++) if(p[i][j] != 0) unite(i, j);
    for(auto sth: dsu1){
        if(sth.size() < 2) continue;
        vector <int> two, one;
        for(int x: sth){
            int o = 0,tw = 0;
            for(int k = 0; k < n; k++){
              	if(k == x) continue;
                if(p[x][k] == 1) o++;
            }
            if(o == 0) two.pb(x);
            else one.pb(x);
        }
        for(int i = 0; i < one.size() - 1; i++){
            int x = one[i], y = one[i+1];
            v[x][y] = 1;
            v[y][x] = 1;
        }
        if(two.size() == 0) continue;
        for(int i = 0; i < two.size() - 1; i++){
            int x = two[i], y = two[i+1];
            v[x][y] = 1;
            v[y][x] = 1;
        }
        if(one.size() == 0){
            int x = two[0], y = two.back();
            v[x][y] = 1;
            v[y][x] = 1;
        }
        else{
            int x = two[0], y = two.back(), z = one[0];
            v[x][z] = 1;
            v[z][x] = 1;
            v[y][z] = 1;
            v[z][y] = 1;
        }
    }
    build(v);
    return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:47:23: warning: unused variable 'tw' [-Wunused-variable]
   47 |             int o = 0,tw = 0;
      |                       ^~
supertrees.cpp:55:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int i = 0; i < one.size() - 1; i++){
      |                        ~~^~~~~~~~~~~~~~~~
supertrees.cpp:61:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |         for(int i = 0; i < two.size() - 1; i++){
      |                        ~~^~~~~~~~~~~~~~~~

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