Submission #441653

#	Time	Username	Problem	Language	Result	Execution time	Memory
441653		linkret	Global Warming (CEOI18_glo)	C++14	0 / 100	337 ms	31680 KiB

glo

#include <bits/stdc++.h>
using namespace std; int h [300000]; int fen [500002]; vector <int> pom; map <int, int> comp;
int dp1 [300000]; int dp2 [300000]; const int MAXN = 500000+1;
//fenwick
int query (int x){
	int sol=0;
	for (x; x>0; x-= (x & -x)) sol=max (sol, fen[x]);
	return sol;
}
void add (int x, int val){
	for (x; x<500002; x+= (x & -x)) fen [x]=max (fen[x], val);
}
int main(){
	//input
	int n, x;
	cin >> n >> x;
	for (int i=0; i<n; i++) cin >> h[i];
	//compression
	for (int i=0; i<n; i++) pom.push_back(h[i]);
	for (int i=0; i<n; i++) pom.push_back(h[i]+x);
	sort (pom.begin(), pom.end());
	for (int i=0; i<pom.size(); i++) comp [pom[i]]=i+1;
	//precompute right dynamic
	for (int i=n-1; i>=0; i--){
		int hi=comp[h[i]];
		int height=MAXN-hi;
		dp2 [i]=query (height)+1;
		add (height+1, dp2[i]);
	}
	//for (int i=0; i<n; i++) cout << dp2[i] << " ";
	memset (fen, 0, sizeof (fen));
	//computing result
	int sol=0;
	for (int i=0; i<n; i++){
		int hi=comp[h[i]+x];
		int res=query (hi)+dp2[i];
		dp1 [i]=query (h[i])+1;
		add (h[i], dp1[i]);
		sol=max (sol, res);
	}
	cout << sol << endl;
	return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int query(int)':
glo.cpp:7:7: warning: statement has no effect [-Wunused-value]
    7 |  for (x; x>0; x-= (x & -x)) sol=max (sol, fen[x]);
      |       ^
glo.cpp: In function 'void add(int, int)':
glo.cpp:11:7: warning: statement has no effect [-Wunused-value]
   11 |  for (x; x<500002; x+= (x & -x)) fen [x]=max (fen[x], val);
      |       ^
glo.cpp: In function 'int main()':
glo.cpp:22:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for (int i=0; i<pom.size(); i++) comp [pom[i]]=i+1;
      |                ~^~~~~~~~~~~

• 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