Submission #398422

#	Time	Username	Problem	Language	Result	Execution time	Memory
398422		amunduzbaev	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	476 ms	112536 KiB

skyscraper

/* made by amunduzbaev */
 
#include <bits/stdc++.h>
 
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
//using namespace __gnu_pbds;
 
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ub upper_bound
#define lb lower_bound
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(),x.rend()
#define NeedForSpeed ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define vv vector
#define tut(x) array<int, x> 
//#define int long long
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii; 
typedef vector<int> vii;
typedef vector<pii> vpii;
 
template<class T> bool umin(T& a, const T& b) { return a > b? a = b, true:false; }
template<class T> bool umax(T& a, const T& b) { return a < b? a = b, true:false; }
//void usaco(string s) { freopen((s+".in").c_str(),"r",stdin);  
	//freopen((s+".out").c_str(),"w",stdout); }
//template<class T> tree<T, 
//less<T>, null_type, rb_tree_tag, 
//tree_order_statistics_node_update> ordered_set;
 
const int N = 3e4+5;
const int mod = 1e9+7;
const ll inf = 1e18;
const ld Pi = acos(-1);
const int M = 2e3+5;
const int B = 500;
 
#define MULTI 0
int n, m, K, s, ans, q, res, a[N];
bitset<N> used, vis[N];
int b[N], p[N];
vii cnt[N];

void solve(int t_case){
	cin>>m>>n;
	for(int i=0;i<n;i++) cin>>b[i]>>p[i], cnt[b[i]].pb(p[i]);
	deque<tut(3)> qq; 
	qq.pb({b[0], p[0], 0}); 
	while(!qq.empty()){
		auto cur = qq.front(); qq.pop_front();
		vis[cur[0]][cur[1]] = 1;
		if(cur[0] == b[1]) { cout<<cur[2]; return; }   
		
		if(!used[cur[0]]){
			for(auto x : cnt[cur[0]]){
				if(vis[cur[0]][x]) continue;
				vis[cur[0]][x] = 1, qq.push_front({cur[0], x, cur[2]});
			} 
		} used[cur[0]] = 1;
		
		if(cur[0] + cur[1] < m && !vis[cur[0] + cur[1]][cur[1]]) qq.pb({cur[0] + cur[1], cur[1], cur[2] + 1}); 
		if(cur[0] - cur[1] >= 0 && !vis[cur[0] - cur[1]][cur[1]]) qq.pb({cur[0] - cur[1], cur[1], cur[2] + 1}); 
	} cout<<-1<<"\n";
}
 
signed main(){ 
	NeedForSpeed
	if(!MULTI) {
		solve(1);
	} else {
		int t; cin>>t;
		for(int t_case = 1; t_case <= t; t_case++) solve(t_case);
	} return 0;
}

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