Submission #1101480

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101480		thanhhoang	K blocks (IZhO14_blocks)	C++14	53 / 100	1045 ms	41724 KiB

blocks

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+53;
int n,k,a[N][20],b[102][N];
int get(int l,int r)
{
    int o=log2(r-l+1);
    return max(a[l][o],a[r-(1<<o)+1][o]);
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if(fopen("blocks.inp","r"))
    {
        freopen("blocks.inp","r",stdin);
        freopen("blocks.out","w",stdout);
    }
    cin>>n>>k;
 
    for(int i=1;i<=n;i++)
        cin>>a[i][0];
 
    for(int i=1;i<=log2(n);i++)
        for(int j=0;j+(1<<i)-1<=n;j++)
            a[j][i]=max(a[j][i-1],a[j+(1<<i-1)][i-1]);
 
    memset(b,0x3f,sizeof b);
    b[0][0]=0;
    for(int i=1;i<=k;i++)
        for(int j=i;j<=n;j++)
            for(int o=max(i,(j-10)*(n*k*n>1e8));o<=j;o++)
                b[i][j]=min(b[i][j],b[i-1][o-1]+get(o,j));
    cout<<b[k][n];
    return 0;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:26:44: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   26 |             a[j][i]=max(a[j][i-1],a[j+(1<<i-1)][i-1]);
      |                                           ~^~
blocks.cpp:16:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen("blocks.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:17:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |         freopen("blocks.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 18 / 18
• Subtask 3: 21 / 21
• Subtask 4: 0 / 47