Submission #785335

#	Time	Username	Problem	Language	Result	Execution time	Memory
785335		devariaota	Global Warming (CEOI18_glo)	C++17	5 / 100	2079 ms	4268 KiB

glo

#include <bits/stdc++.h>
using namespace std;

#define int long long

int n, x, t[200005], ans = 0;

// int binser(set<int, greater<int>> memo, int find) {

// }

void solve(int l, int r, int s) {
  // cout << l << " " << r << " " << s << endl;
  map<int, int> maks;
  set<int, greater<int>> memo;
  set<int>::iterator it;
  int cur;

  for (int i = l; i <= r; i++) {
    t[i] += s;
  }

  stack<int> st;
  int temp;
  for (int i = 1; i <= n; i++) {
    while (!st.empty()) {
      if (t[i] <= st.top()) st.pop();
      else break;
    }
    st.push(t[i]);
    // pq.push(t[i]);
    memo.insert(t[i]);
    temp = st.size();
    maks[t[i]] = max(maks[t[i]], temp);
    // int cur = pq.top();
    // pq.pop();
    // maks[t[i]] = max(maks[t[i]], maks[pq.top()]+1);
    // pq.push(cur);
    if (memo.size() > 1) {
      // it = memo.begin();
      // it++;
      // cur = *it;
      // maks[t[i]] = max(maks[t[i]], maks[cur]+1);

      // binser
      // cout << "set : ";
      for (it = memo.begin(); it != memo.end(); it++) {
        if ((*it) == t[i]) break;
        // cout << *it << " ";
      }
      // cout << endl;
      // it++;
      it++;
      if (it != memo.end()) {
        maks[t[i]] = max(maks[t[i]], maks[*it]+1);  
      }
      
      // cout << cur << endl;
      // maks[t[i]] = max(maks[t[i]], maks[cur]+1);
    }
    temp = maks[t[i]];
    // cout << i << " " << t[i] << " " << temp << endl;
    ans = max(temp, ans);
  }

  for (int i = l; i <= r; i++) {
    t[i] -= s;
  }
}

signed main() {
  cin >> n >> x;
  for (int i = 1; i <= n; i++) cin >> t[i];

  if (x == 0) {
    solve(1, n, 0);
    cout << ans << endl;
    return 0;
  }

  for (int l = 1; l <= n; l++) {
    for (int r = l; r <= n; r++) {
      for (int s = -x; s <= x; s++) {
        solve(l, r, s);
      }
    }
  }

  cout << ans << endl;
}

Compilation message (stderr)

glo.cpp: In function 'void solve(long long int, long long int, long long int)':
glo.cpp:17:7: warning: unused variable 'cur' [-Wunused-variable]
   17 |   int cur;
      |       ^~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 17
• Subtask 7: 0 / 25