Submission #328507

#	Time	Username	Problem	Language	Result	Execution time	Memory
328507		minoum	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1053 ms	2156 KiB

skyscraper

#include<bits/stdc++.h>
#pragma("unroll-loops")
 
using namespace std;
typedef long long int ll;
 
const int MAXN = 3e4 + 1, inf = 1e5;
int n, m, b[2], d[MAXN], sz = 0, mn, u;
bool wasmn[MAXN];
vector <int> ps[MAXN];
 
/* 
inline void dij(){
	for(int i = 0; i < n; i++) d[i] = inf;
	d[b[0]] = 0;
	for(int h = 0; h < n; h++){
		mn = inf, u = -1;
		for(int i = 0; i < n; i++)
			if(!wasmn[i] && d[i] < mn) mn = d[i], u = i;
		wasmn[u] = true;
		if(u == b[1] || d[u] >= inf) return;
		for(int k: ps[u]){
			for(int i = u % k; i < n; i += k)
				if(d[i] > d[u] + (abs(u - i) / k)) d[i] = d[u] + (abs(u - i) / k);
		}
	}
	return;
}
*/
 
int main()
{
//	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
//	cin >> n >> m;
	scanf("%d", &n); scanf("%d", &m);
	int bb, pp;
	for(int i = 0; i < m; i++){
//		cin >> bb >> pp;
		scanf("%d", &bb); scanf("%d", &pp);
		ps[bb].push_back({pp});
		if(i == 0) b[0] = bb;
		if(i == 1) b[1] = bb;
	}
//	dij();
	for(int i = 0; i < n; i++) d[i] = inf;
	d[b[0]] = 0;
	for(int h = 0; h < n; h++){
		mn = inf, u = -1;
		for(int i = 0; i < n; i++)
			if(!wasmn[i] && d[i] < mn) mn = d[i], u = i;
		wasmn[u] = true;
		if(u == b[1] || d[u] >= inf) break;
		for(int k: ps[u]){
			for(int i = u % k; i < n; i += k)
				if(d[i] > d[u] + (abs(u - i) / k)) d[i] = d[u] + (abs(u - i) / k);
		}
	}
//	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:2: warning: ignoring #pragma (  [-Wunknown-pragmas]
    2 | #pragma("unroll-loops")
      | 
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |  scanf("%d", &n); scanf("%d", &m);
      |  ~~~~~^~~~~~~~~~
skyscraper.cpp:35:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |  scanf("%d", &n); scanf("%d", &m);
      |                   ~~~~~^~~~~~~~~~
skyscraper.cpp:39:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |   scanf("%d", &bb); scanf("%d", &pp);
      |   ~~~~~^~~~~~~~~~~
skyscraper.cpp:39:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |   scanf("%d", &bb); scanf("%d", &pp);
      |                     ~~~~~^~~~~~~~~~~

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