제출 #482094

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
482094		Neos	Po (COCI21_po)	C++14	70 / 70	12 ms	1784 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> ii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<vii> vvii;
 
#define task "test"
#define fastIO ios::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL)
#define forw(i, l, r) for( ll i = (l) ; i < (r) ; i++ )
#define forb(i, r, l) for( ll i = (r) ; i >= (l) ; i-- )
#define numBit(x) (__builtin_popcountll(1ll * (x)))
#define getBit(x, i) ((x) >> (i) & 1)
#define sz(x) (int)x.size()
#define mp make_pair
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define pob pop_back
#define pof pop_front
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define debug(x) cerr << #x << " = " << x << '\n';
 
const int N = 1e5 + 7;
const ll inf = 0x3f3f3f3f;

int n, a[N];

int main() {
  fastIO;

  cin >> n;
  forw(i, 1, n + 1) cin >> a[i];

  int ans = 0;
  stack<int> st;

  st.push(0);
  forw(i, 1, n + 1) {
    while (!st.empty() && a[st.top()] > a[i]) {
      ++ans;
      st.pop();
    }
    if (!st.empty() && a[st.top()] < a[i]) st.push(i);
  } 
  ans += sz(st) - 1;
  cout << ans << endl;
}

• Subtask 1: 70 / 70