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Submission #1022938

# Submission time Handle Problem Language Result Execution time Memory
1022938 2024-07-14T07:47:55 Z m5588ohammed Hacker (BOI15_hac) C++14
100 / 100
 173 ms 164692 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define mod 1000000007
int pre[500005],suf[500005],arr[500005]; 
int MX[22][500005],MX2[22][500005];
int n,mx,ans,j;
void sparsMX(){
    for(int k=1;k<=20;k++){
        for(int i=0;i+(1ll<<k-1)<=n;i++) MX[k][i]=max(MX[k-1][i],MX[k-1][i+(1ll<<k-1)]);  
        for(int i=0;i+(1ll<<k-1)<=n+1;i++) MX2[k][i]=max(MX2[k-1][i],MX2[k-1][i+(1ll<<k-1)]);
    }        
}
int findMX(int l,int r){
    int siz=log2(((r-l)+1));
    return max(MX[siz][l],MX[siz][r+1-(1ll<<siz)]);
}
int findMX2(int l,int r){
    int siz=log2(((r-l)+1));
    return max(MX2[siz][l],MX2[siz][r+1-(1ll<<siz)]);
}
int calc1(int i){
    if(n-j<=i) return (i-(n-j)); 
    else return 0;
}
int calc2(int i){
    if(i<=j) return (n+1)-((j-i)+1);
    else return n+1;
}
signed main()
{
    cin>>n;
    j=n/2;
    for(int i=1;i<=n;i++){
        cin>>arr[i];
        pre[i]=pre[i-1]+arr[i];
    }
    for(int i=n;i>=1;i--) suf[i]=suf[i+1]+arr[i];
    for(int i=0;i<=n;i++){
        if(i>=j) MX[0][i]=pre[i]-pre[i-j];
        else{
            MX[0][i]=pre[i]+suf[n+1-(j-i)];
        }
    }
    for(int i=n+1;i>=1;i--){
        if((n-i)+1>=j) MX2[0][i]=suf[i]-suf[i+j];
        else{
            MX2[0][i]=suf[i]+pre[j-((n-i)+1)];
        }
    }
    sparsMX();
    for(int i=1;i<=n;i++){
        ans=max(ans,pre[n]-max(findMX(calc1(i),i-1),findMX2(i+1,calc2(i))));    
    }
    cout<<ans<<endl;
    return 0;
}

Compilation message

hac.cpp: In function 'void sparsMX()':
hac.cpp:10:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   10 |         for(int i=0;i+(1ll<<k-1)<=n;i++) MX[k][i]=max(MX[k-1][i],MX[k-1][i+(1ll<<k-1)]);
      |                             ~^~
hac.cpp:10:83: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   10 |         for(int i=0;i+(1ll<<k-1)<=n;i++) MX[k][i]=max(MX[k-1][i],MX[k-1][i+(1ll<<k-1)]);
      |                                                                                  ~^~
hac.cpp:11:30: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   11 |         for(int i=0;i+(1ll<<k-1)<=n+1;i++) MX2[k][i]=max(MX2[k-1][i],MX2[k-1][i+(1ll<<k-1)]);
      |                             ~^~
hac.cpp:11:88: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   11 |         for(int i=0;i+(1ll<<k-1)<=n+1;i++) MX2[k][i]=max(MX2[k-1][i],MX2[k-1][i+(1ll<<k-1)]);
      |                                                                                       ~^~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2472 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 0 ms 2652 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 0 ms 2396 KB Output is correct
16 Correct 0 ms 2652 KB Output is correct
17 Correct 1 ms 4696 KB Output is correct
18 Correct 1 ms 4700 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2472 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 0 ms 2652 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 0 ms 2396 KB Output is correct
16 Correct 0 ms 2652 KB Output is correct
17 Correct 1 ms 4696 KB Output is correct
18 Correct 1 ms 4700 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 4700 KB Output is correct
21 Correct 1 ms 2648 KB Output is correct
22 Correct 1 ms 3164 KB Output is correct
23 Correct 2 ms 5724 KB Output is correct
24 Correct 1 ms 3164 KB Output is correct
25 Correct 2 ms 3676 KB Output is correct
26 Correct 2 ms 3676 KB Output is correct
27 Correct 0 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1 ms 2392 KB Output is correct
30 Correct 2 ms 5724 KB Output is correct
31 Correct 2 ms 3676 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 2652 KB Output is correct
3 Correct 2 ms 5724 KB Output is correct
4 Correct 24 ms 24920 KB Output is correct
5 Correct 59 ms 63316 KB Output is correct
6 Correct 75 ms 79956 KB Output is correct
7 Correct 96 ms 96512 KB Output is correct
8 Correct 163 ms 164432 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 0 ms 2396 KB Output is correct
3 Correct 1 ms 2652 KB Output is correct
4 Correct 0 ms 2396 KB Output is correct
5 Correct 1 ms 4444 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 1 ms 2472 KB Output is correct
8 Correct 1 ms 4700 KB Output is correct
9 Correct 1 ms 2652 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 0 ms 2652 KB Output is correct
12 Correct 1 ms 4700 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 0 ms 2396 KB Output is correct
16 Correct 0 ms 2652 KB Output is correct
17 Correct 1 ms 4696 KB Output is correct
18 Correct 1 ms 4700 KB Output is correct
19 Correct 1 ms 2652 KB Output is correct
20 Correct 1 ms 4700 KB Output is correct
21 Correct 1 ms 2648 KB Output is correct
22 Correct 1 ms 3164 KB Output is correct
23 Correct 2 ms 5724 KB Output is correct
24 Correct 1 ms 3164 KB Output is correct
25 Correct 2 ms 3676 KB Output is correct
26 Correct 2 ms 3676 KB Output is correct
27 Correct 0 ms 2396 KB Output is correct
28 Correct 1 ms 2396 KB Output is correct
29 Correct 1 ms 2392 KB Output is correct
30 Correct 2 ms 5724 KB Output is correct
31 Correct 2 ms 3676 KB Output is correct
32 Correct 1 ms 2396 KB Output is correct
33 Correct 1 ms 2652 KB Output is correct
34 Correct 2 ms 5724 KB Output is correct
35 Correct 24 ms 24920 KB Output is correct
36 Correct 59 ms 63316 KB Output is correct
37 Correct 75 ms 79956 KB Output is correct
38 Correct 96 ms 96512 KB Output is correct
39 Correct 163 ms 164432 KB Output is correct
40 Correct 4 ms 4952 KB Output is correct
41 Correct 6 ms 7512 KB Output is correct
42 Correct 8 ms 11992 KB Output is correct
43 Correct 123 ms 63252 KB Output is correct
44 Correct 159 ms 164436 KB Output is correct
45 Correct 28 ms 32848 KB Output is correct
46 Correct 95 ms 96336 KB Output is correct
47 Correct 173 ms 164428 KB Output is correct
48 Correct 172 ms 164692 KB Output is correct
49 Correct 148 ms 163716 KB Output is correct
50 Correct 150 ms 163664 KB Output is correct