Submission #925549

#	Time	Username	Problem	Language	Result	Execution time	Memory
925549		pan	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	748 ms	4408 KiB

skyscraper

#include <bits/stdc++.h>
#define mp make_pair
#define f first
#define s second
#define pb push_back
#define input(x) scanf("%d", &x);
#define print(x, y) printf("%d%c", x, y);
using namespace std;
typedef int ll;
typedef pair<ll, ll> pi;
 
ll const INF = 1e9;
vector<ll> adj[30005];
ll where[30005];
int main()
{
	ll n, m, b, p;
	input(n); input(m);
	vector<ll> adj[n];
	ll where[m];
	vector<ll> dist(n, INF);
	for (ll i=0; i<m; ++i) 
	{
		input(b); input(p);
		adj[b].pb(p);
		where[i] = b;
	}
	set<pi> s;
	dist[where[0]] = 0;
	s.insert(mp(0, where[0]));
	while (!s.empty())
	{
		ll c= s.begin()->s;
		s.erase(s.begin());
		for (ll u: adj[c])
		{
			ll jump = 0;
			for (ll x=c+u; x<n; x+=u)
			{
				jump++;
				if (dist[x]>dist[c]+jump)
				{
					if (dist[x]!=INF) s.erase(mp(dist[x], x));
					dist[x] = dist[c]+jump;
					s.insert(mp(dist[x], x));
				}
			}
			jump = 0;
			for (ll x=c-u; x>=0; x-=u)
			{
				jump++;
				if (dist[x]>dist[c]+jump)
				{
					if (dist[x]!=INF) s.erase(mp(dist[x], x));
					dist[x] = dist[c]+jump;
					s.insert(mp(dist[x], x));
				}
			}
		}
	}
	if (dist[where[1]]==INF) {print(-1, '\n');}
	else {print(dist[where[1]], '\n');}
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:6:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define input(x) scanf("%d", &x);
      |                  ~~~~~^~~~~~~~~~
skyscraper.cpp:18:2: note: in expansion of macro 'input'
   18 |  input(n); input(m);
      |  ^~~~~
skyscraper.cpp:6:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define input(x) scanf("%d", &x);
      |                  ~~~~~^~~~~~~~~~
skyscraper.cpp:18:12: note: in expansion of macro 'input'
   18 |  input(n); input(m);
      |            ^~~~~
skyscraper.cpp:6:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define input(x) scanf("%d", &x);
      |                  ~~~~~^~~~~~~~~~
skyscraper.cpp:24:3: note: in expansion of macro 'input'
   24 |   input(b); input(p);
      |   ^~~~~
skyscraper.cpp:6:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 | #define input(x) scanf("%d", &x);
      |                  ~~~~~^~~~~~~~~~
skyscraper.cpp:24:13: note: in expansion of macro 'input'
   24 |   input(b); input(p);
      |             ^~~~~

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