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Submission #510257

# Submission time Handle Problem Language Result Execution time Memory
510257 2022-01-14T21:22:05 Z thiago_bastos Jakarta Skyscrapers (APIO15_skyscraper) C++17
0 / 100
 2 ms 2672 KB 
#include "bits/stdc++.h"

using namespace std;

using i64 = long long;
using u64 = unsigned long long;
using i32 = int;
using u32 = unsigned;
using i16 = short;
using u16 = unsigned short;
using ld = long double;
using ii = pair<int, int>;

const int N = 3e4 + 100, K = 174, INF = 1e9;

vector<int> P[N];
unordered_map<int, int> jumps[N];

void solve() {
	int n, m;

	cin >> n >> m;

	vector<int> cnt(n, INF);
	queue<ii> q;

	int x0 = -1, x1 = -1;

	for(int i = 0; i < m; ++i) {
		int b, p;
		cin >> b >> p;
		if(!i) x0 = i;
		else if(i == 1) x1 = i;
		for(int x = b % p; x < n; x += p) jumps[x][p] = -1;
		P[b].push_back(p);
	}

	for(int p : P[x0]) {
		if(jumps[x0][p] == -1) {
			jumps[x0][p] = 0;
			q.emplace(x0, p);
		}
	}

	while(!q.empty()) {
		auto [x, p] = q.front();
		q.pop();
		int j = jumps[x][p];	
		cnt[x] = min(cnt[x], j);
		if(x == x1) break;
		if(x >= p && jumps[x - p][p] == -1) {
			jumps[x - p][p] = 1 + j;
			q.emplace(x - p, p);
		}
		if(x + p <= n && jumps[x + p][p] == -1) {
			jumps[x + p][p] = 1 + j;
			q.emplace(x + p, p);
		}
		while(!P[x].empty()) {
			int k = P[x].back();
			P[x].pop_back();
			if(jumps[x][k] == -1) {
				jumps[x][k] = j;
				q.emplace(x, k);
			}
		}
	}

	if(cnt[x1] == INF) cout << "-1\n";
	else cout << cnt[x1] << '\n';
}

int main() {
	ios_base :: sync_with_stdio(false);
	cin.tie(0);
	int t = 1;
	//cin >> t;
	while(t--) solve();
	return 0;
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2652 KB Output is correct
2 Correct 1 ms 2636 KB Output is correct
3 Incorrect 2 ms 2636 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 1 ms 2636 KB Output is correct
3 Incorrect 1 ms 2636 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2672 KB Output is correct
2 Correct 2 ms 2672 KB Output is correct
3 Incorrect 1 ms 2636 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2636 KB Output is correct
2 Correct 2 ms 2668 KB Output is correct
3 Incorrect 2 ms 2636 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Incorrect 1 ms 2636 KB Output isn't correct
4 Halted 0 ms 0 KB -