Submission #301601

#	Time	Username	Problem	Language	Result	Execution time	Memory
301601		Dilshod_Imomov	Connecting Supertrees (IOI20_supertrees)	C++17	40 / 100	272 ms	22264 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 1e3 + 7;
int nn, comp, used[N], cc[N], cmp[N], ok, first[N], nb[N][2];
set < int > sz[N];

int construct(std::vector<std::vector<int>> p) {
	nn = p.size();
	std::vector<std::vector<int>> answer;
	vector < pair < int, int > > vc;
	for (int i = 0; i < nn; i++) {
		std::vector<int> row;
		row.resize(nn);
		answer.push_back(row);
	}
	int sub1 = 1, sub2 = 0;
	for ( int i = 0; i < nn; i++ ) {
        for ( int j = 0; j < nn ;j++ ) {
            if ( p[i][j] == 2 ) {
                sub1 = 0;
            }
        }
	}
	if ( !sub1 ) {
        for ( int i = 0; i < nn; i++ ) {
            for ( int j = 0; j < nn; j++ ) {
                if ( p[i][j] == 1 && i != j ) {
                    p[i][j] = 2;
                    p[j][i] = 2;
                    vc.push_back( { i, j } );
                    vc.push_back( { j, i } );
                    sub2 = 1;
                }
            }
        }
	}
	for ( int i = 0; i < nn; i++ ) {
        if ( !cc[i] ) {
            cc[i] = ++comp;
            first[comp] = i;
            sz[cc[i]].insert(i);
        }
        cmp[ cc[i] ] = i;
        for ( int j = 0; j < nn; j++ ) {
            if ( p[i][j] && i != j ) {
                if ( cc[j] && cc[j] != cc[i] ) {
                    return 0;
                }
                if(  cc[j] ) {
                    continue;
                }
                cc[j] = cc[i];
                sz[cc[i]].insert(j);
                nb[ cmp[ cc[i] ] ][1] = j;
                nb[ j ][0] = cmp[ cc[i] ];
                answer[ cmp[ cc[i] ] ][j] = 1;
                answer[ j ][ cmp[ cc[i] ] ] = 1;
                cmp[ cc[i] ] = j;
            }
        }
	}
	if ( !sub1 ) {
        for ( int i = 1; i <= comp; i++ ) {
            if ( !sub1 && sub2 ) {
                if ( sz[i].size() == 2 ) {
                    auto it = sz[i].begin();
                    used[*it] = 1;
                    it++;
                    used[*it] = 1;
                    continue;
                }
            }
            if ( cmp[ i ] != first[i] ) {
                answer[cmp[i]][first[i]] = 1;
                answer[ first[i] ][cmp[i]] = 1;
                nb[ cmp[i] ][1] = first[i];
                nb[ first[i] ][0] = cmp[i];
            }
            if ( sz[i].size() == 2 ) {
                return 0;
            }
        }
	}
	if ( !sub1 && sub2 ) {
        for ( auto pr: vc ) {
            int u = pr.first, v = pr.second;
            if ( used[u] || used[v] ) {
                continue;
            }
            //cout << u << ' ' << v << endl;
            //cout << nb[u][0] << ' ' << u << ' ' << nb[u][1] << '\n';
            if ( nb[u][1] == v ) {
                //cout << 1 << endl;
                answer[v][ nb[v][1] ] = 0;
                answer[ nb[v][1] ][v] = 0;
                answer[ u ][ nb[v][1] ] = 1;
                answer[ nb[v][1] ][ u ] = 1;
                used[v] = 1;
                nb[u][1] = nb[v][1];
                nb[ nb[v][1] ][0] = u;
            }
            else {
                //cout << 2 << endl;
                answer[v][ nb[v][0] ] = 0;
                answer[ nb[v][0] ][v] = 0;
                answer[ u ][ nb[v][0] ] = 1;
                answer[ nb[v][0] ][ u ] = 1;
                used[v] = 1;
                nb[u][0] = nb[v][0];
                nb[ nb[v][0] ][1] = u;
            }
            //cout << nb[u][0] << ' ' << u << ' ' << nb[u][1] << endl;
        }
        for ( int i = 0; i < nn; i++ ) {
            answer[i][i] = 0;
        }
        build(answer);
        return 1;
	}
    for ( int i = 0; i < nn; i++ ) {
        for ( int j = 0; j < nn; j++ ) {
            if ( cc[i] == cc[j] ) {
                if ( !p[i][j] || !p[j][i] ) {
                    return 0;
                }
            }
        }
    }
	build(answer);
	return 1;
}
/*
7
1 2 2 2 1 0 0
2 1 2 2 2 0 0
2 2 1 1 2 0 0
2 2 1 1 2 0 0
1 2 2 2 1 0 0
0 0 0 0 0 1 1
0 0 0 0 0 1 1
*/

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