Submission #495237

#	Time	Username	Problem	Language	Result	Execution time	Memory
495237		vinnipuh01	Evacuation plan (IZhO18_plan)	C++17	41 / 100	4074 ms	94784 KiB

plan

#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>

using namespace std;

const long long oo = 1000000000000000000;

long long int  sum, ans = 0, mx = 0, mn = 1000000000, num, pos;


/*
    ViHHiPuh

   (( `'-""``""-'` ))
     )-__-_.._-__-(
   / --- (o _ o) --- \
   \ .-* ( .0. ) *-. /
   _'-. ,_ '=' _, .-'_
  / `;#'#'# - #'#'#;` \
 \_)) -----'#'----- ((_/
      # --------- #
  '# ------- ------ #'
  /..-'# ------- #'-.\
  _\...-\'# -- #'/-.../_
  ((____)- '#' -(____))


    cout << fixed << setprecision(6) << x;


    freopen ( "sum.in", "r", stdin )
*/

int d[ 100001 ], p[ 100001 ], dp[ 100001 ][ 20 ], col[ 100001 ];
queue <int> q;
set <pair<int, int> > st;
vector <pair<int, int> > v[ 100001 ], vv;
map <pair<int, int>, int> answer, mp;
map <int, int> dd;


int main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
	int n, m;
	cin >> n >> m;
	int x, y, z;
	for ( int i = 1; i <= m; i ++ ) {
		cin >> x >> y >> z;
		x --;
		y --;
		v[ x ].push_back( { y, z } );
		v[ y ].push_back( { x, z } );
	}
	for ( int i = 0; i < n; i ++ )
		d[ i ] = mn;
	int k;
	cin >> k;
	int a;
	for ( int i = 1; i <= k; i ++ ) {
		cin >> a;
		a --;
		q.push( a );
		d[ a ] = 0;
	}
	while ( q.size() ) {
		num = q.front();
		q.pop();
		for ( auto to : v[ num ] ) {
			if ( d[ to.first ] > d[ num ] + to.second ) {
				d[ to.first ] = d[ num ] + to.second;
				q.push( to.first );
			}
		}
	}
	int qq;
	cin >> qq;
	int l[ 100001 ], r[ 100001 ];
	for ( int t = 1; t <= qq; t ++ ) {
		cin >> l[ t ] >> r[ t ];
		l[ t ] --;
		r[ t ] --;
		mp[ { l[ t ], r[ t ] } ] = mp[ { l[ t ], r[ t ] } ] = 1;
		col[ l[ t ] ] ++;
		col[ r[ t ] ] ++;
	} 
	for ( int i = 0; i < n; i ++ )
		vv.push_back( { col[ i ], i } );
	sort( vv.rbegin(), vv.rend() );
	for ( auto j : vv ) {
		int i = j.second;
		dd.clear();
		if ( col[ i ] ) {
			st.clear();
			dd[ i ] = d[ i ];
			st.insert( { dd[ i ], i } );
			while ( st.size() ) {
				num = st.rbegin()->second;
				if ( mp[ { i, num } ] ) {
					col[ i ] --;
					mp[ { i, num } ] = mp[ { num, i } ] = 0;
					answer[ { i, num } ] = answer[ { num, i } ] = dd[ num ];
					col[ num ] --;
					if ( !col[ i ] )
						break;
				}
				st.erase( --st.end() );
				for ( auto to : v[ num ] ) {
					if ( dd[ to.first ] < min( d[ to.first ], dd[ num ] ) ) {
						st.erase( { dd[ to.first ], to.first } );
						dd[ to.first ] = min( d[ to.first ], dd[ num ] );
						st.insert( { dd[ to.first ], to.first } );
					}
				}
			}
		}
	}
	for ( int i = 1; i <= qq; i ++ )
		cout << answer[ { l[ i ], r[ i ] } ] << "\n";
}

/*
9 12
1 9 4
1 2 5
2 3 7
2 4 3
4 3 6
3 6 4
8 7 10
6 7 5
5 8 1
9 5 7
5 4 12
6 8 2
2
4 7
5
1 6
5 3
4 8
5 8
1 5

*/

• Subtask 1: 10 / 10
• Subtask 2: 0 / 13
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 0 / 46