Submission #1077884

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077884		ntdaccode	K blocks (IZhO14_blocks)	C++17	0 / 100	48 ms	86560 KiB

blocks

#include<bits/stdc++.h>
#define fori(i,a,b) for(int i=a;i<=b;i++)
#define int long long
#define ii pair<int,int>
#define fi first
#define se second
#define pb push_back
using namespace std;
const int mod=1e9+7;
const int M=1e6+10;
const int N=1e3+10;
int n,k,f[100010][110],a[100010];
int32_t main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  #define task "1"
  if(fopen(task".inp","r"))
  {
    freopen(task".inp","r",stdin);
    freopen(task".out","w",stdout);
  }
  cin >> n >> k;
  fori(i,1,n) cin >> a[i];
  memset(f,61,sizeof(f));
  f[0][1]=0;
  fori(i,1,n) f[i][1]=max(f[i-1][1],a[i]);
  f[0][1]=1e16;
  fori(j,2,k)
  {
    stack<int> sk;
    fori(i,1,n)
    {
      f[i][j]=f[i-1][j-1]+a[i];//cout << f[i][j] << " ";
      while(!sk.empty()&&a[sk.top()]<=a[i])
      {
        f[i][j]=min(f[i][j],f[sk.top()+1][j-1]+a[i]);
        f[i][j]=min(f[i][j],f[sk.top()][j]+a[i]-a[sk.top()]);
        sk.pop();
      }
      if(sk.size())
      {
        f[i][j]=min(f[i][j],f[sk.top()+1][j-1]+a[i]);
        f[i][j]=min(f[i][j],f[sk.top()][j]);
      }
      sk.push(i);

    }
  }
  cout << f[n][k];
}

Compilation message (stderr)

blocks.cpp: In function 'int32_t main()':
blocks.cpp:21:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     freopen(task".inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:22:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |     freopen(task".out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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