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Submission #436390

# Submission time Handle Problem Language Result Execution time Memory
436390 2021-06-24T13:12:58 Z keta_tsimakuridze Exam (eJOI20_exam) C++14
42 / 100
 1000 ms 5324 KB 
#include<bits/stdc++.h>
#define f first
#define s second
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;
	}	

	if(!F) { 
		for(int i=1;i<=n;i++) {
			if(c[b[i]].size() && ok(c[b[i]][0],i)) {
				int x = getans(1,1,c[b[i]][0],1,n);
				update(1,c[b[i]][0],1,n,x + 1);
			}
		}
		cout<<tree[1];
		
		return 0;
	}
	for(int i=1;i<=n;i++){
		c[a[i]].push_back(i);
	}
	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:30:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   30 |  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 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 9 ms 588 KB Output is correct
3 Correct 19 ms 1732 KB Output is correct
4 Correct 17 ms 1868 KB Output is correct
5 Correct 34 ms 1844 KB Output is correct
6 Correct 20 ms 1868 KB Output is correct
7 Correct 20 ms 1868 KB Output is correct
8 Correct 31 ms 1868 KB Output is correct

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 112 ms 972 KB Output is correct
2 Execution timed out 1058 ms 5324 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 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
0 / 22.0

# 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 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 Incorrect 1 ms 332 KB Output isn't correct
8 Halted 0 ms 0 KB -