Submission #321575

#	Time	Username	Problem	Language	Result	Execution time	Memory
321575		minoum	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1039 ms	2540 KiB

skyscraper

#include<bits/stdc++.h>
#pragma GCC optimization ("unroll-loops")

using namespace std;
typedef long long int ll;

const int MAXN = 3e4 + 5, inf = INT_MAX / 2;
int n, m, b[MAXN], p[MAXN], d[MAXN], cnt[MAXN], sz = 0;
bool wasmn[MAXN];
vector <int> ps[MAXN];

int findmn(){
	ll mn = inf, ind = -1;
	for(int i = 0; i < n; i++)
		if(!wasmn[i] && d[i] < mn) mn = d[i], ind = i;
	return ind;
}

void dij(){
	for(int i = 0; i < n; i++) d[i] = inf;
	d[b[0]] = 0;
	for(int h = 0; h < n; h++){
		int u = findmn();
		wasmn[u] = true;
		if(u == b[1] || d[u] >= inf) return;
		for(auto k: ps[u]){
			for(int i = u % k; i < n; i += k)
				if(i != u && cnt[i] && 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;
	for(int i = 0; i < m; i++){
		cin >> b[i] >> p[i];
		cnt[b[i]]++;
		ps[b[i]].push_back({p[i]});
	}
	dij();
	cout << ((d[b[1]] >= inf)?-1:d[b[1]]) << '\n';
	return 0; 
}

Compilation message (stderr)

skyscraper.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("unroll-loops")
      |

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