Submission #513285

#	Time	Username	Problem	Language	Result	Execution time	Memory
513285		vinnipuh01	Commuter Pass (JOI18_commuter_pass)	C++17	15 / 100	775 ms	54640 KiB

commuter_pass

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

using namespace std;

const long long oo = 1000000000000000000;

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


/*
    ViHHiPuh

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


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

    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

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

vector <pair<int, int> > v[ 100001 ], vv[ 100001 ];
set <pair<int, int> > st;
int d[ 100001 ], p[ 100001 ], dd[ 100001 ];
map <pair<int, int>, bool> mp;

main () {
	int n, m;
	cin >> n >> m;
	int s, t;
	cin >> s >> t;
	int ss, tt;
	cin >> ss >> tt;
	int x[ m + 1 ], y[ m + 1 ], z[ m + 1 ];
	for ( int i = 1; i <= n; i ++ )
		d[ i ] = oo;
	for ( int i = 1; i <= m; i ++ ) {
		cin >> x[ i ] >> y[ i ] >> z[ i ];
		v[ x[ i ] ].push_back( { y[ i ], z[ i ] } );
		v[ y[ i ] ].push_back( { x[ i ], z[ i ] } );
	}
	d[ s ] = 0;
	st.insert( { d[ s ], s } );
	p[ s ] = -1;
	while ( st.size() ) {
		num = st.begin()->second;
		st.erase( st.begin() );
		for ( auto to : v[ num ] ) {
			if ( d[ to.first ] > to.second + d[ num ] ) {
				st.erase( { d[ to.first ], to.first } );
				d[ to.first ] = d[ num ] + to.second;
				p[ to.first ] = num;
				st.insert( { d[ to.first ], to.first } );
			}
		}
	}
	for ( int i = t; i != s; i = p[ i ] ) {
		mp[ { i, p[ i ] } ] = mp[ { p[ i ], i } ] = 1;
	}
	for ( int i = 1; i <= m; i ++ ) {
		if ( mp[ { x[ i ], y[ i ] } ] ) {
//			cout << x[ i ] << " " << y[ i ] << "\n";
			z[ i ] = 0;
		}
		vv[ x[ i ] ].push_back( { y[ i ], z[ i ] } );
		vv[ y[ i ] ].push_back( { x[ i ], z[ i ] } );
	}
	for ( int i = 1; i <= n; i ++ )
		dd[ i ] = oo;
	dd[ ss ] = 0;
	st.insert( { dd[ ss ], ss } );
	while ( st.size() ) {
		num = st.begin()->second;
		st.erase( st.begin() );
		for ( auto to : vv[ num ] ) {
			if ( dd[ to.first ] > to.second + dd[ num ] ) {
				st.erase( { dd[ to.first ], to.first } );
				dd[ to.first ] = to.second + dd[ num ];
				st.insert( { dd[ to.first ], to.first } );
			}
		}
	}
	cout << dd[ tt ];
}

Compilation message (stderr)

commuter_pass.cpp:51:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   51 | main () {
      | ^~~~

• Subtask 1: 0 / 16
• Subtask 2: 15 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45