Submission #495125

#	Time	Username	Problem	Language	Result	Execution time	Memory
495125		vinnipuh01	Evacuation plan (IZhO18_plan)	C++17	23 / 100	4030 ms	84464 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 ], dd[ 100001 ], p[ 100001 ];
queue <int> q;
set <pair<int, int> > st;
vector <pair<int, int> > v[ 100001 ];
map <pair<int, int>, bool> mp;

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;
		mp[ { x, y } ] = mp[ { y, x } ] = 1;
		v[ x ].push_back( { y, z } );
		v[ y ].push_back( { x, z } );
	}
	for ( int i = 1; i <= n; i ++ )
		d[ i ] = mn;
	int k;
	cin >> k;
	int a;
	for ( int i = 1; i <= k; i ++ ) {
		cin >> 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, r;
	while ( qq -- ) {
		cin >> l >> r;
		if ( mp[ { l, r } ] )
			cout << min( d[ l ], d[ r ] ) << "\n";
		else {
			for ( int i = 1; i <= n; i ++ )
				dd[ i ] = 0;
			dd[ l ] = d[ l ];
			q.push( l );
			p[ l ] = -1;
			st.insert( { dd[ l ], l } );
			while ( st.size() ) {
				num = st.rbegin()->second;
				if ( num == r )
					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 ] );
						p[ to.first ] = num;
						st.insert( { dd[ to.first ], to.first } );
					}
				}
			}
			num = r;
			mx = oo;
			for ( int i = num; i != -1; i = p[ i ] ) {
				mx = min( mx, dd[ i ] + 0ll );
			}
			cout << mx << "\n";
		}
	} 
}

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