Submission #95945

#	Time	Username	Problem	Language	Result	Execution time	Memory
95945		Retro3014	Skyscraper (JOI16_skyscraper)	C++17	5 / 100	18 ms	376 KiB

skyscraper

#include <iostream>
#include <stdio.h>
#include <vector>
#include <algorithm>

using namespace std;
typedef long long ll;
#define MAX_N 100
#define DIV 1000000007LL
int N;
vector<int> v;
ll ans;

bool chk[MAX_N+1];
int arr[MAX_N+1];
ll L, L2;

int zero(int x){
	return (x>0?x:-x);
}


void dfs(int x){
	if(x==N){
		if(L>=L2){
			ans++;
			return;
		}
	}else{
		for(int i=0; i<N; i++){
			if(!chk[i]){
				arr[x] = i;
				chk[i] = true;
				if(x!=0){
					L2+=(ll)zero(v[arr[x]]-v[arr[x-1]]);
				}
				dfs(x+1);
				chk[i] = false;
				if(x!=0){
					L2-=(ll)zero(v[arr[x]]-v[arr[x-1]]);
				}
				arr[x] = 0;
			}
		}
	}
}

void solve1(){
	dfs(0);
	return;
}

void solve2(){
	return;
}

int main(){
	scanf("%d%lld", &N, &L);
	for(int i=0; i<N; i++){
		int x; scanf("%d", &x); v.push_back(x);
	}
	if(N<=8){
		solve1();
	}else{
		solve2();
	}
	printf("%lld", ans);
	return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:58:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%lld", &N, &L);
  ~~~~~^~~~~~~~~~~~~~~~~~
skyscraper.cpp:60:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int x; scanf("%d", &x); v.push_back(x);
          ~~~~~^~~~~~~~~~

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