Submission #1104165

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104165		vjudge1	Global Warming (CEOI18_glo)	C++17	0 / 100	36 ms	3940 KiB

glo

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

const int N = 2e5 + 3;
int ar[N];

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n, x; cin >> n >> x;
  for(int i=1; i<=n; ++i) cin >> ar[i];

  int res = 1;
  int dp[n+1];
  dp[0] = 0;
  vector<int> lis;
  for(int i=1; i<=n; ++i) {
    auto t = lower_bound(lis.begin(), lis.end(), ar[i]);
    if(t == lis.end()) lis.emplace_back(ar[i]);
    else *t = ar[i];

    dp[i] = lis.size();
  }

  res = lis.size();
  lis.clear();
  for(int i=n; i>=1; --i) {

    int x = lower_bound(lis.begin(), lis.end(), -ar[i] + x) - lis.begin();

    if(x == lis.size()) lis.emplace_back(-ar[i] + x);
    else lis[x] = -ar[i] + x;

    res = max(res, dp[i-1] + (int)lis.size());
  }

  cout << res << '\n';
  return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:30:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     if(x == lis.size()) lis.emplace_back(-ar[i] + x);
      |        ~~^~~~~~~~~~~~~
glo.cpp:28:56: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |     int x = lower_bound(lis.begin(), lis.end(), -ar[i] + x) - lis.begin();
      |                                                 ~~~~~~~^~~

• Subtask 1: 0 / 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