Submission #314070

#	Time	Username	Problem	Language	Result	Execution time	Memory
314070		tushar_2658	Global Warming (CEOI18_glo)	C++14	100 / 100	86 ms	7800 KiB

glo

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

const int maxn = 200005;
using ll = long long;

ll a[maxn], x;
int n;

int main(int argc, char const *argv[])
{
  scanf("%d %lld", &n, &x);
  for(int i = 1; i <= n; ++i){
    scanf("%lld", &a[i]);
  }
  vector<ll> dp(n + 1, 1e15);
  dp[0] = -1e15;
  vector<int> L(n + 1);
  for(int i = 1; i <= n; ++i){
    int idx = lower_bound(dp.begin(), dp.end(), a[i]) - dp.begin();
    dp[idx] = a[i];
    L[i] = idx;
  }
  vector<ll> dp1(n + 1, 1e15);
  dp1[0] = -1e15;
  int ans = 0;
  for(int i = n; i >= 1; --i){
    int idx = lower_bound(dp1.begin(), dp1.end(), -a[i]) - dp1.begin();
    int idx1 = lower_bound(dp1.begin(), dp1.end(), -a[i] + x) - dp1.begin();
    dp1[idx] = -a[i];
    ans = max(ans, L[i] + idx1 - 1);
  }
  cout << ans << endl;

  return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main(int, const char**)':
glo.cpp:12:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |   scanf("%d %lld", &n, &x);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~
glo.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   14 |     scanf("%lld", &a[i]);
      |     ~~~~~^~~~~~~~~~~~~~~

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