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Submission #436380

# Submission time Handle Problem Language Result Execution time Memory
436380 2021-06-24T13:05:25 Z keta_tsimakuridze Exam (eJOI20_exam) C++14
77 / 100
 1000 ms 5900 KB 
#include<bits/stdc++.h>
#define f first
#define s second
#define int long long
using namespace std;
const int N=5000+5,M=1e5+5,mod=1e9+7;
int t,b[M],a[M],dp[N],ans,n,tree[4*M],r[M],l[M];
map<int,vector<int> > c;
bool ok(int x,int y) {
	if(x<=y && r[x] > y) return 1;
	if(x>y && l[x]<y) return 1;
	return 0;
}
void update(int u,int ind,int l,int r,int val) {
	if(l>ind || r<ind) return;
	if(l==r) {
		tree[u] = val;
		return;
	}
	int mid=(l+r)/2;
	update(2*u,ind,l,mid,val);
	update(2*u+1,ind,mid+1,r,val);
	tree[u] = max(tree[2*u],tree[2*u+1]);
}
int getans(int u,int start,int end,int l,int r){
	if(l>end || r<start) return 0;
	if(start<=l && r<=end) return tree[u];
	int mid = (l+r)/2;
	return max(getans(2*u,start,end,l,mid),getans(2*u+1,start,end,mid+1,r));
}
 main(){
	cin>>n;
	int F = 0;
	for(int i=1;i<=n;i++) {
		cin >> a[i];
		if(a[i] < a[i-1]) F = 1;
	}
	int f = 0;
	for(int i=1;i<=n;i++){
		cin >> b[i];
		if(i-1 && b[i]!=b[i-1]) f = 1;
	} 
	for(int i=1;i<=n;i++) {
		int x = i - 1;
		while(x && a[x] <= a[i]) {
			x = l[x];
		}
		l[i] = x;
	}
	for(int i=n;i>=1;i--){
		int x = i + 1;
		while(x<=n &&  a[x]<=a[i]) {
			x = r[x];
		}
		r[i] = x;
	}
	int ans = 0;
	//f = 1;
	if(!f) {
	
		for(int i=1;i<=n;i++){
			int j = i - 1,F = 0;
			while(j<n && a[j+1] <= b[1]) {
				j ++;
				if(b[1]==a[j]) F = 1;
			}
			if(F) ans += j - i + 1;
			i = max(i,j);
		}
		cout<<ans;
		return 0;
	}	
	for(int i=1;i<=n;i++){
		c[a[i]].push_back(i);
	}
	if(!F) { ;
		for(int i=1;i<=n;i++) {
			if(c[b[i]].size() && ok(c[b[i]][0],i)) {
				update(1,c[b[i]][0],1,n,getans(1,1,c[b[i]][0],1,n) + 1);
			}
		}
		cout<<tree[1];
		
		return 0;
	}

	for(int i=1;i<=n;i++) {
		for(int j=c[b[i]].size() - 1;j>=0;j--) {
			int ind = c[b[i]][j];
			dp[ind] = dp[ind] + ok(ind,i);
		}
		for(int j=1;j<=n;j++) {
			dp[j] = max(dp[j],dp[j-1]);
			ans = max(dp[j],ans);
			
		} //cout<<endl;
	}
	cout<<ans;
}

Compilation message

exam.cpp:31:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   31 |  main(){
      |  ^~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 332 KB Output is correct
2 Correct 19 ms 840 KB Output is correct
3 Correct 57 ms 4120 KB Output is correct
4 Correct 41 ms 3808 KB Output is correct
5 Correct 101 ms 5380 KB Output is correct
6 Correct 38 ms 3712 KB Output is correct
7 Correct 44 ms 3940 KB Output is correct
8 Correct 101 ms 5264 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 4 ms 588 KB Output is correct
4 Correct 8 ms 1024 KB Output is correct
5 Correct 9 ms 1136 KB Output is correct
6 Correct 9 ms 1100 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 106 ms 1040 KB Output is correct
2 Execution timed out 1081 ms 5900 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct

Subtask #6
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 4 ms 588 KB Output is correct
10 Correct 8 ms 1024 KB Output is correct
11 Correct 9 ms 1136 KB Output is correct
12 Correct 9 ms 1100 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 332 KB Output is correct
22 Correct 6 ms 332 KB Output is correct
23 Correct 5 ms 460 KB Output is correct
24 Correct 169 ms 460 KB Output is correct
25 Correct 119 ms 588 KB Output is correct
26 Correct 105 ms 588 KB Output is correct
27 Correct 111 ms 576 KB Output is correct
28 Correct 105 ms 872 KB Output is correct
29 Correct 7 ms 972 KB Output is correct
30 Correct 103 ms 872 KB Output is correct
31 Correct 107 ms 876 KB Output is correct
32 Correct 102 ms 844 KB Output is correct