Submission #330581

#	Time	Username	Problem	Language	Result	Execution time	Memory
330581		minoum	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1087 ms	3432 KiB

skyscraper

#include<bits/stdc++.h>
///#pragma GCC optimization ("unroll-loops")
 
using namespace std;
typedef long long int ll;
 
const int MAXN = 3e4+1, inf = INT_MAX / 2;
int n, m, b[MAXN], p[MAXN], d[MAXN], tmp;
vector <int> ps[MAXN];
priority_queue <pair<int,int>> q;
 
int main()
{
//	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
//	cin >> n >> m;
	scanf("%d", &n); scanf("%d", &m);
	for(int i = 0; i < m; i++){
//		cin >> bb >> pp;
		scanf("%d", b+i); scanf("%d", p+i);
		ps[b[i]].push_back({p[i]});
	}
	for(int i = 0; i < n; i++) d[i] = inf;
	d[b[0]] = 0;
	q.push({0, b[0]});
	while(!q.empty()){
		int u = q.top().second, dd = -q.top().second; q.pop();
		if(d[u] < dd) continue;
//		if(u == b[1] || d[u] >= inf) break;
		for(int k: ps[u]){
			/*for(int i = u % k; i < n; i += k){
				tmp = abs(u - i);
				if(d[i] > d[u] + (tmp / k)){
					d[i] = d[u] + (tmp / k);
					q.push({-d[i], i});
				}
			}*/
			for(int i = u % k; i < u; i += k)
				if(d[i] > d[u] + (u - i) / k){
					d[i] = d[u] + (u - i) / k;
					q.push({-d[i], i});
				}
			for(int i = u + k; i < n; i += k)
				if(d[i] > d[u] + (i - u) / k){
					d[i] = d[u] + (i - u) / k;
					q.push({-d[i], i});
				}
		}
	}
//	cout << ((d[b[1]] >= inf)?-1:d[b[1]]);
	if(d[b[1]] >= inf) printf("%d", -1);
	else printf("%d", d[b[1]]);
	return 0; 
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d", &n); scanf("%d", &m);
      |  ~~~~~^~~~~~~~~~
skyscraper.cpp:16:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d", &n); scanf("%d", &m);
      |                   ~~~~~^~~~~~~~~~
skyscraper.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |   scanf("%d", b+i); scanf("%d", p+i);
      |   ~~~~~^~~~~~~~~~~
skyscraper.cpp:19:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   19 |   scanf("%d", b+i); scanf("%d", p+i);
      |                     ~~~~~^~~~~~~~~~~

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