Submission #785318

#	Time	Username	Problem	Language	Result	Execution time	Memory
785318		andecaandeci	Global Warming (CEOI18_glo)	C++17	10 / 100	208 ms	6092 KiB

glo

#include<bits/stdc++.h>
#define int long long
using namespace std;
int pre, n, x;
vector<int> a;
int cnt(int idx) {
  vector<int> temp=a, dp;
  for(int i=0; i<n; i++) {
    if(i<=idx) temp[i]-=x;
    auto it=lower_bound(dp.begin(), dp.end(), temp[i]);
    if(it==dp.end()) dp.push_back(temp[i]);
    else *it=temp[i];
  }
  return dp.size();
}
signed main() {
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  cin >> n >> x;
  a.resize(n);
  vector<int> dp;
  for(int &p : a) {
    cin >> p;
    auto it=lower_bound(dp.begin(), dp.end(), p);
    if(it==dp.end()) dp.push_back(p);
    else *it=p;
  }
  pre=dp.size();
  int l=0, r=n-1;
  while(l<=r) {
    int mid=l+r>>1;
    int now=cnt(mid);
    if(now>=pre) r=mid-1, pre=now;
    else l=mid+1;
  }
  cout << pre << '\n';
  return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:30:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   30 |     int mid=l+r>>1;
      |             ~^~

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