Submission #248367

#	Time	Username	Problem	Language	Result	Execution time	Memory
248367		sahil_k	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	36 / 100	367 ms	262148 KiB

skyscraper

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

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:28:22: warning: 'start' may be used uninitialized in this function [-Wmaybe-uninitialized]
  ord.insert(make_pair(0, start));
             ~~~~~~~~~^~~~~~~~~~
skyscraper.cpp:41:14: 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: 0 / 21
• Subtask 5: 0 / 43