Submission #1168634

#	Time	Username	Problem	Language	Result	Execution time	Memory
1168634		tkm_algorithms	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	0 / 100	2 ms	324 KiB

skyscraper

/**
*    In the name of Allah
*    We are nothing and you're everything
*    author: najmuddin
**/
#include <bits/stdc++.h>
using namespace std;
	
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
typedef long long ll;
#define int ll
 
const char nl = '\n';
const int N = 1e5+5;
const int inf = 1e18+10;

void solve() {
	int n, m; cin >> n >> m;
	
	vector<int> b(m), p(m);
	vector<tuple<int, int>> g[n];
	for (int i = 0; i < m; ++i) {
		cin >> b[i] >> p[i];
		int k = 1;
		while (b[i]-p[i]*k >= 0)g[b[i]].push_back({b[i]-p[i]*k, k}), k++;
		k = 1;
		while (b[i]+p[i]*k < n)g[b[i]].push_back({b[i]+p[i]*k, k}), k++;
	}
	
	vector<int> vis(n+1, inf);
	vis[b[0]] = 0;
	
	queue<tuple<int, int>> q;
	q.push({b[0], 0});
	
	while (!q.empty()) {
		auto [x, a] = q.front();
		q.pop();
		
		for (auto [i, w]: g[x]) {
			if (vis[i] > w+a)q.push({i, a+w}), vis[i] = a+w;
		}
	}
	
	if (vis[b[1]] == inf)vis[b[1]] = -1;
	cout << vis[b[1]];
}

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    freopen("input.txt", "r", stdin);
    
    int T = 1;
    for (int _ = 0; _ < T; ++_) {
		solve();
	}
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int32_t main()':
skyscraper.cpp:54:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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