Submission #499337

#	Time	Username	Problem	Language	Result	Execution time	Memory
499337		pavement	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	265 ms	262148 KiB

skyscraper

#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;
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
//#define int long long
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define g0(a) get<0>(a)
#define g1(a) get<1>(a)
#define g2(a) get<2>(a)
#define g3(a) get<3>(a)
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef double db;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tree<ii, null_type, less<ii>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int C = 200;
int N, M, st, ed, dist[30005][205];
vector<iii> adj[30005][205];
priority_queue<iii, vector<iii>, greater<iii> > pq;

main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> N >> M;
	for (int i = 0; i < N; i++) {
		for (int j = 1; j < C; j++) {
			if (i + j < N) adj[i][j].eb(i + j, j, 1);
			if (i - j >= 0) adj[i][j].eb(i - j, j, 1);
			dist[i][j] = 1e9;
			adj[i][j].eb(i, 0, 0);
		}
		dist[i][0] = 1e9;
	}
	for (int i = 0, B, P; i < M; i++) {
		cin >> B >> P;
		if (P >= C) {
			for (int j = B + P; j < N; j += P)
				adj[B][0].eb(j, 0, (j - B) / P);
			for (int j = B - P; j >= 0; j -= P)
				adj[B][0].eb(j, 0, (B - j) / P);
		} else {
			adj[B][0].eb(B, P, 0);
		}
		if (i == 0) st = B;
		else if (i == 1) ed = B;
	}
	pq.emplace(0, st, 0);
	dist[st][0] = 0;
	while (!pq.empty()) {
		auto [d, x, y] = pq.top();
		pq.pop();
		if (d != dist[x][y]) continue;
		if (x == ed) return cout << d << '\n', 0;
		for (auto [u, v, w] : adj[x][y]) {
			if (dist[u][v] > d + w) {
				dist[u][v] = d + w;
				pq.emplace(dist[u][v], u, v);
			}
		}
	}
	cout << "-1\n";
}

Compilation message (stderr)

skyscraper.cpp:33:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   33 | main() {
      | ^~~~

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