FIRS - Hàng cây

Tác giả: happyboy99x

Ngôn ngữ: C++

#include <algorithm>
#include <bitset>
#include <cctype>
#include <cfloat>
#include <climits>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <utility>
#include <vector>
using namespace std;

typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vii> vvii;
typedef vector<int> vi;
typedef vector<vi> vvi;

#define sz(a) int((a).size())
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define all(c) (c).begin(), (c).end()
#define tr(c,i) for(typeof((c).begin()) i = (c).begin(), _e = (c).end(); it != _e; ++it)
#define present(c,x) ((c).find(x) != (c).end())
#define cpresent(c,x) (find(all(c),x) != (c).end())
#define rep(i,n) for(int i = 0, _n = (n); i < _n; ++i)
#define repd(i,n) for(int i = (n)-1; i >= 0; --i )
#define fo(i,a,b) for(int i = (a), _b = (b); i <= _b; ++i)
#define fod(i,a,b) for(int i = (a), _b = (b); i >= _b; --i)

#define INF 1000000000
#define N 100005

bool dead[N]; int n;

int main() {
	//freopen( "input.txt", "r", stdin );
	//freopen( "output.txt", "w", stdout );
	scanf( "%d", &n );
	priority_queue< ii, vii, greater<ii> > qu;
	fo(i,1,n) {
		int t; scanf( "%d", &t );
		qu.push(ii(t, i));
	}
	int res = 0;
	for(; !qu.empty(); qu.pop()) {
		int v = qu.top().se;
		if( dead[v] == 0 ) {
			dead[v] = dead[v-1] = dead[v+1] = 1;
			++res;
		}
	}
	printf( "%d\n", res );
	return 0;
}

Download