Submission #1221356

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define all(v) begin(v), end(v)
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define reps(i, s, n) for(int i = (int)(s); i < (int)(n); i++)

template<class T1, class T2> void chmin(T1 &a, T2 b){if(a>b)a=b;}
template<class T1, class T2> void chmax(T1 &a, T2 b){if(a<b)a=b;}

using pint = pair<int, int>;
using tint = tuple<int, int, int>;
using vint = vector<int>;

const int inf = 1LL << 55;
const int mod = 1e9 + 7;

signed main()
{
  cin.tie(0);
  ios_base::sync_with_stdio(0);
  cout << fixed << setprecision(12);

  int N;
  cin >> N;
  vint A;
  rep(i, N) {
    int a; cin >> a;
    if(A.empty() || A.back() != a) A.push_back(a);
  }
  if(N == 1) {
    cout << 1 << endl;
    return 0;
  }
  bool up = A[0] < A[1];
  int cnt = 1;
  reps(i, 1, N) {
    //cout<<i<<" "<<up<<" "<<A[i-1]<<" "<<A[i]<<endl;
    if(up) {
      if(A[i-1] > A[i]) i++, cnt++, up = A[i-1] < A[i];
    } else {
      if(A[i-1] < A[i]) i++, cnt++, up = A[i-1] < A[i];
    }
  }
  cout << cnt << endl;

  return 0;
}

Submission Info

Judge Result