Submission #552891

#	Time	Username	Problem	Language	Result	Execution time	Memory
552891		M_W	Skyscraper (JOI16_skyscraper)	C++14	5 / 100	2088 ms	304 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
bool vis[102];
set<int> s;
int a[102];
int N, L, ans = 0;

void sol(int idx, int sm, int old){
	if(idx > N && sm <= L){
		ans++;
		return;
	}
	if(idx > 1){
		int tmp = sm;
		auto it1 = s.begin();
		auto it2 = s.end(); it2--;
		tmp += min(abs(a[old] - *it1), abs(a[old] - *it2));
		
		if(s.size() > 1) tmp += abs(*it2 - *it1);
		if(tmp > L) return;
	}
	
	for(int i = 1; i <= N; i++){
		if(vis[i]) continue;
		vis[i] = true;
		s.erase(a[i]);
		sol(idx + 1, sm + abs((old == -1 ? a[i] : a[old]) - a[i]), i);
		s.insert(a[i]);
		vis[i] = false;
	}
}

int main(){
	scanf("%d %d", &N, &L);
	for(int i = 1; i <= N; i++){
		scanf("%d", &a[i]);
		s.insert(a[i]);
	}
	sort(a + 1, a + N + 1);
	sol(1, 0, -1);
	printf("%d", ans);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:34:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |  scanf("%d %d", &N, &L);
      |  ~~~~~^~~~~~~~~~~~~~~~~
skyscraper.cpp:36:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 80