oj.uz

Submission #436384

# Submission time Handle Problem Language Result Execution time Memory
436384 2021-06-24T13:06:41 Z keta_tsimakuridze Exam (eJOI20_exam) C++14
77 / 100
 1000 ms 6084 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(){
 	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
	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 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 8 ms 864 KB Output is correct
3 Correct 24 ms 3132 KB Output is correct
4 Correct 22 ms 3436 KB Output is correct
5 Correct 37 ms 3360 KB Output is correct
6 Correct 21 ms 3376 KB Output is correct
7 Correct 21 ms 3332 KB Output is correct
8 Correct 36 ms 3396 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 3 ms 588 KB Output is correct
4 Correct 6 ms 1100 KB Output is correct
5 Correct 6 ms 1100 KB Output is correct
6 Correct 7 ms 1100 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 1064 KB Output is correct
2 Execution timed out 1071 ms 6084 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 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 332 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 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 2 ms 332 KB Output is correct
9 Correct 3 ms 588 KB Output is correct
10 Correct 6 ms 1100 KB Output is correct
11 Correct 6 ms 1100 KB Output is correct
12 Correct 7 ms 1100 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 1 ms 332 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 7 ms 476 KB Output is correct
23 Correct 2 ms 460 KB Output is correct
24 Correct 179 ms 592 KB Output is correct
25 Correct 114 ms 588 KB Output is correct
26 Correct 113 ms 588 KB Output is correct
27 Correct 114 ms 588 KB Output is correct
28 Correct 105 ms 940 KB Output is correct
29 Correct 5 ms 1040 KB Output is correct
30 Correct 102 ms 916 KB Output is correct
31 Correct 103 ms 932 KB Output is correct
32 Correct 120 ms 1048 KB Output is correct