Submission #26867

#	Time	Username	Problem	Language	Result	Execution time	Memory
26867		szawinis	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	0 / 100	0 ms	3716 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
const int MAX = (3e4)+1, INF = 1e9;

int n, m, bc, sz, d[MAX];
vector<int> a[MAX];
vector<pair<int,int> > g[MAX];
int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cin >> n >> m;
	bc = sqrt(n), sz = n/bc;
	for(int i = 0, pos, len; i < m; i++) {
		cin >> pos >> len;
		a[pos].push_back(len);
	}
	for(int i = 0; i < n; i++) for(int len: a[i]) {
		for(int j = i-len; j >= 0; j -= len) g[i].emplace_back(j, (i-j)/len);
		for(int j = i+len; j < n; j += len) g[i].emplace_back(j, (j-i)/len);
	}
	fill(d+1, d+n, INF);
	priority_queue<pair<int,int> > pq;
	pq.emplace(0, 0);
	while(!pq.empty()) {
		int u = pq.top().second;
		pq.pop();
		for(auto p: g[u]) {
			int v, w; tie(v, w) = p;
			if(d[u] + w < d[v]) {
				d[v] = d[u] + w;
				pq.emplace(-d[v], v);
			}
		}
	}
	cout << (d[1] == INF ? -1 : d[1]);
}

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