제출 #223598

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
223598		infinite_iq	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	185 ms	65508 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] ;
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 ++ ;
                                v[i].pb ( { j , len } ) ;
                                if ( s[j] .count ( u ) ) break ;
                        }
                        len = 0 ;
                        for ( int j = i - u ; j >= 0 ; j -= u ) {
                                len ++ ;
                                v[i].pb ( { j , len } ) ;
                                if ( s[j] .count ( u ) ) break ;
                        }
                }
        }
        priority_queue< pair<int , int> , vector< pair<int , int> > , greater< pair<int , int> > > st ;
        dis [sta] = 0 ;
        st .push ( { 0 , sta } ) ;
        while ( st.size() ) {
                int node = st.top().se;
                int t = st.top().fi;
                st .pop();
                if ( node == en ) {
                        printf("%d\n",t);
                        exit(0);
                }
                if ( t > dis[node] ) C ;
                for ( auto U : v[node] ) {
                        int u = U.fi ;
                        int x = U.se ;
                        if ( t + x < dis [u] ) {
                                dis [u] = t + x ;
                                st.push ( { dis[u] , u } ) ;
                        }
                }
        }
        printf("-1\n");
}

컴파일 시 표준 에러 (stderr) 메시지

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: 43 / 43