Submission #248375

#	Time	Username	Problem	Language	Result	Execution time	Memory
248375		sahil_k	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	133 ms	262148 KiB

skyscraper

#include <iostream>
#include <vector>
#include <set>
using namespace std;
int main () {
	int n, m;
	cin >> n >> m;
	int adj[n][n];
	for (int i=0; i<n; i++) {
		for (int j=0; j<n; j++) {
			adj[i][j] = 1e9;
		}
	}
	int bi, pi;
	int start, end;
	for (int i=0; i<m; i++) {
		cin >> bi >> pi;
		if (i == 0) start = bi;
		if (i == 1) end = bi;
		for (int j=1; j<n; j++) {
			if (bi-j*pi >= 0) adj[bi][bi-j*pi] = min(adj[bi][bi-j*pi], j);
			if (bi+j*pi < n) adj[bi][bi+j*pi] = min(adj[bi][bi+j*pi], j);
		}
	}
	set< pair<int, int> > ord;
	int dist[n];
	bool vis[n];
	for (int i=0; i<n; i++) {
		dist[i] = 1e9;
		vis[i] = false;
	}
	dist[start] = 0;
	ord.insert(make_pair(0, start));
	while (ord.size() > 0) {
		pair<int, int> cur = *ord.begin();
		ord.erase(ord.begin());
		vis[cur.second] = true;
		for (int i=0; i<n; i++) {
			if (!vis[i] && cur.first+adj[cur.second][i] < dist[i]) {
				ord.erase(make_pair(dist[i], i));
				dist[i] = cur.first+adj[cur.second][i];
				ord.insert(make_pair(dist[i], i));
			}
		}
	}
	if (dist[end] == 1e9) {
		cout << -1 << endl;
	} else {
		cout << dist[end] << endl;
	}
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:33:22: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ord.insert(make_pair(0, start));
             ~~~~~~~~~^~~~~~~~~~
skyscraper.cpp:46:14: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if (dist[end] == 1e9) {
      ~~~~~~~~^

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