Submission #223559

#	Time	Username	Problem	Language	Result	Execution time	Memory
223559		infinite_iq	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1084 ms	38540 KiB

skyscraper

#define fast ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#include <bits/stdc++.h>
using namespace std;
#define sqr 547
#define mid (l+r)/2
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define lb lower_bound
#define ub upper_bound
#define ins insert
#define era erase
#define C continue
#define mem(dp,i) memset(dp,i,sizeof(dp))
#define mset multiset
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef short int si;
typedef long double ld;
typedef pair<int,int> pi;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pi> vpi;
typedef vector<pll> vpll;
const ll inf=1e18;
const ld pai=acos(-1);
int n , m , sta , en ;
vpi v[30009] ;
unordered_set<int>s[30009];
int dis[30009] , done[30009] ;
int main () {
        scanf("%d%d",&n,&m);
        for ( int i = 0 ; i < m ; i ++ ) {
                int pos , x ;
                scanf("%d%d",&pos,&x);
                if ( i == 0 ) sta = pos ;
                if ( i == 1 ) en  = pos ;
                s[pos].ins ( x ) ;
        }
        for ( int i = 0 ; i < n ; i ++ ) {
                dis [i] = 1e9 ;
                for ( auto u : s[i] ) {
                        int len = 0 ;
                        for ( int j = i + u ; j < n ; j += u ) {
                                len ++ ;
                                int a = i ;
                                int b = j ;
                                v[a].pb ( { b , len } ) ;
                                if ( s[j] .find ( u ) != s[j] .end()  ) break ;
                        }
                        len = 0 ;
                        for ( int j = i - u ; j >= 0 ; j -= u ) {
                                len ++ ;
                                int a = i ;
                                int b = j ;
                                v[a].pb ( { b , len } ) ;
                                if ( s[j] .find ( u ) != s[j] .end()  ) break ;
                        }
                }
        }
        set<pi>st;
        dis [sta] = 0 ;
        st .ins ( { 0 , sta } ) ;
        while ( st.size() ) {
                int node = st.begin()->se;
                int t = st.begin()->fi;
                st .era( st.begin() );
                done [ node ] =1 ;
                for ( auto U : v[node] ) {
                        int u = U.fi ;
                        int x = U.se ;
                        if ( done [u] ) C ;
                        if ( st.find ( { dis[u] , u } ) != st.end() ) st.era ( { dis[u] , u } ) ;
                        dis [u] = min ( dis[u] , t + x ) ;
                        st.ins ( { dis[u] , u } ) ;
                }
        }
        if ( dis [ en ] == 1e9 ) dis[ en ] = -1 ;
        printf("%d\n",dis[en]);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&n,&m);
         ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:37:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%d%d",&pos,&x);
                 ~~~~~^~~~~~~~~~~~~~~~

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