Submission #1036249

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036249		coolsentenceidontremember	Global Warming (CEOI18_glo)	C++17	100 / 100	39 ms	5344 KiB

glo

#include<bits/stdc++.h>

#pragma GCC optimize("O3", "unroll-loops")


#define ll long long
#define ld long double
#define ff first
#define ss second
#define db double
#define time_begin() auto begin = chrono::high_resolution_clock::now()
#define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds";
#define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother"

using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}





int main(){
   setIO();
   int n, x;
   cin >> n >> x;
   int a[n];
   for (int &i : a) cin >> i;
   int l[n], r[n];
   vector<int> lis;
   for (int i = 0; i < n; i++){
   	 int pos = lower_bound(lis.begin(), lis.end(), a[i]) - lis.begin();
   	 if (pos == lis.size()) lis.push_back(a[i]);
   	 else lis[pos] = a[i];
   	 l[i] = pos+1;
   	}
    lis.clear();
    for (int i = n-1; i >= 0; i--){
    	int pos = lower_bound(lis.begin(), lis.end(), -a[i] + x) - lis.begin();
    	r[i] = pos;
    	pos = lower_bound(lis.begin(), lis.end(), -a[i]) - lis.begin();
    	if (pos == lis.size()) lis.push_back(-a[i]);
    	else lis[pos] = -a[i];
	}
	int ans = 0;
	for (int i = 0; i < n; i++) ans = max(ans, l[i] + r[i]);
	cout << ans;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:41:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |      if (pos == lis.size()) lis.push_back(a[i]);
      |          ~~~~^~~~~~~~~~~~~
glo.cpp:50:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |      if (pos == lis.size()) lis.push_back(-a[i]);
      |          ~~~~^~~~~~~~~~~~~
glo.cpp: In function 'void setIO(std::string)':
glo.cpp:22:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:23:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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