Submission #735936

#	Time	Username	Problem	Language	Result	Execution time	Memory
735936		Cutebol	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	239 ms	262144 KiB

skyscraper

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace __gnu_pbds;
using namespace std;

void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
#define Ganyu ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define endl "\n"
#define ff first
#define ss second
  
const int N = 3e4 + 5 ;
const int inf = 1e9 ;
const int mod = 1e9 + 7 ;

int n , m , ans = inf ;
int p[N] , d[N] ;
vector <pair <int , int> > g[N] ;

void djikstra( int s ){
	
	set <pair <int , int> > q ;
	q.insert({0,s}) ;
	d[s] = 0 ; 
	while ( !q.empty() ){
		int v = q.begin()->ss ;
		q.erase(q.begin()) ;
		for ( auto to : g[v] ){
			if ( d[to.ff] > d[v]+to.ss ){
				q.erase({d[to.ff],to.ff}) ;
				d[to.ff] = d[v]+to.ss ;
				q.insert({d[to.ff],to.ff}) ;
			}
		}
	}
	
}

void solve(){
	int a , b ;
	cin >> n >> m ;
	for ( int i = 0 ; i < n ; i ++ ) d[i] = inf ;
	for ( int i = 0 ; i < m ; i ++ ) {
		int x , y ;
		cin >> x >> p[x] ;
		if (!i) a = x ;
		if(i==1) b = x ;
		for ( int j = x + p[x] ; j < n ; j += p[x] ) g[x].push_back( { j , ( j - x ) / p[x] } ) ;
		for ( int j = x - p[x] ; j >= 0 ; j -= p[x] ) g[x].push_back( { j , ( x - j ) / p[x] } ) ;
	}
	djikstra(a) ;
	if ( d[b] == inf ) cout << -1 ;
	else cout << d[b] ;
}
signed main(){
//	fopn("") ;
//	Ganyu ;
	int t = 1 ;
//	cin >> t ;
	while ( t -- ) solve() ;
	
}

Compilation message (stderr)

skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:48:11: warning: unused variable 'y' [-Wunused-variable]
   48 |   int x , y ;
      |           ^
skyscraper.cpp: In function 'void fopn(std::string)':
skyscraper.cpp:8:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:8:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp: In function 'void solve()':
skyscraper.cpp:56:10: warning: 'b' may be used uninitialized in this function [-Wmaybe-uninitialized]
   56 |  if ( d[b] == inf ) cout << -1 ;
      |       ~~~^
skyscraper.cpp:55:10: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   55 |  djikstra(a) ;
      |  ~~~~~~~~^~~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43