Submission #928099

#	Time	Username	Problem	Language	Result	Execution time	Memory
928099		OAleksa	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	2 ms	2136 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int N = 30069;
const int inf = 1e18;
int n, m, a[N], b[N], dis[N];;
vector<int> c[N];
vector<pair<int, int>> g[N];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> m;
  	for (int i = 1;i <= m;i++) {
  		cin >> a[i] >> b[i], ++a[i];
  		c[a[i]].push_back(i);
  	}
  	for (int i = 1;i <= m;i++) {
  		for (int j = a[i], d = 0;j <= n;j += b[i], d++) {
  			for (auto x : c[j]) {
  				g[i].push_back({x, d});
  			}
  		}
  		for (int j = a[i], d = 0;j >= 1;j -= b[i], d++) {
  			for (auto x : c[j]) {
  				g[i].push_back({x, d});
  			}
  		}
  	}
  	for (int i = 1;i <= m;i++)
  		dis[i] = inf;
		set<pair<int, int>> q;
		q.insert({0, 1});
		dis[1] = 0;
		while (!q.empty()) {
			auto v = (*q.begin()).s;
			q.erase(q.begin());
			if (v == 2)
				break;
			for (auto u : g[v]) {
				if (dis[u.f] <= dis[v] + u.s)
					continue;
				dis[u.f] = dis[v] + u.s;
				q.insert({-dis[u.f], u.f});
			}
		}
  	if (dis[2] == inf)
  		cout << -1 << '\n';
  	else
  		cout << dis[2] << '\n';
  }
  return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:35:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   35 |    for (int i = 1;i <= m;i++)
      |    ^~~
skyscraper.cpp:37:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   37 |   set<pair<int, int>> q;
      |   ^~~

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