Submission #436899

#	Time	Username	Problem	Language	Result	Execution time	Memory
436899		Karliver	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	49 ms	10268 KiB

skyscraper

 
	
#include <bits/stdc++.h>

#define FIXED_FLOAT(x)  std::fixed <<std::setprecision(20) << (x)
#define all(v) (v).begin(), (v).end()
using namespace  std;
#define forn(i,n) for (int i = 0; i < (n); ++i)
#define rforn(i, n) for(int i = (n) - 1;i >= 0;--i)
using ll = long long;
int mod = (ll)1e9 + 7;
#define PI acos(-1)
typedef pair<int, int> pairs;

const int INF = 1e9 + 1;
const int N = 2e5 + 100;
const double eps = 1e-7;

template <class T> using V = vector<T>;  
template <class T> using VV = V<V<T>>;  

template <typename XPAX>
void ckma(XPAX &x, XPAX y) {
    x = (x < y ? y : x);
}
template <typename XPAX>
void ckmi(XPAX &x, XPAX y) {
    x = (x > y ? y : x);
}
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
void solve() {


	int n, m;
	cin >> n >> m;

	V<set<int>> s(n);
	VV<pairs> g(n);
	V<int> f(m), p(m);
	
	V<int> vis(n, false);

	forn(i, m) {
		cin >> f[i] >> p[i];

		s[f[i]].insert(p[i]);
		
	}


	int x;
	for(int i = 0;i < n;++i) {
		for(auto c : s[i]) {
			x = i - c;
			while(x >= 0) {
				if(s[x].size())g[i].push_back({(i - x) / c, x});
				if(s[x].count(c))break;
				x -= c;
			}

			x = i + c;
			while(x < n) {
				if(s[x].size())g[i].push_back({(x - i) / c, x});
				if(s[x].count(c))break;
				x += c;
			}
		}
	}



	

	priority_queue<pairs, V<pairs>, greater<pairs>> q;

	q.push({0, f[0]});
	V<int> dis(n, INF);
	dis[f[0]] = 0;

	//debug(dis);
	while(q.size()) {
		x = q.top().second;
		int s = q.top().first;
		q.pop();

		if(vis[x])continue;
		vis[x] = 1;
		if(x == f[1]) {
			cout << s << '\n';
			exit(0);
		}
		for(auto c : g[x]) {
			if(s + c.first < dis[c.second]) {
				q.push({s + c.first, c.second});
				dis[c.second] = s + c.first;
			}
		}
	}


	cout << -1 << '\n';






}
void test_case() {
    int t;
    cin >> t;
    forn(p, t) {

        //cout << "Case #" << p + 1 << ": ";
        solve();
    }
}
int main() {

    ios::sync_with_stdio(false);
    cin.tie(0);

    solve();

}
        

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