Submission #1077129

#	Time	Username	Problem	Language	Result	Execution time	Memory
1077129		duyhoanho	K blocks (IZhO14_blocks)	C++14	0 / 100	44 ms	80312 KiB

blocks

#include <bits/stdc++.h>
#define task ""
#define int long long
#define forinc(i,a,b) for(int i=a;i<=b;i++)
using namespace std;
const int N=1e5+10;
int n,a[N],dp[N][102],k;
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  if (fopen ("blocks.in", "r")) {
    freopen ("blocks.inp", "r", stdin);
    freopen ("blocks.out", "w", stdout);
  }
  cin>>n>>k;
  memset(dp,99,sizeof dp);
  int mx=0;
  forinc(i,1,n)
  {
    cin>>a[i];
    mx=max(mx,a[i]);
    dp[i][1] = mx;
    dp[i][0] = 0;
  }
  dp[0][0]=0;
  for(int j=2;j<=k;j++)
  {
    stack<int> st;
    for(int i=1;i<=n;i++)
    {
      while(st.size() && a[st.top()] <= a[i] )
      {
        dp[i][j] = min(dp[i][j] , dp[st.top()][j-1] + a[i]);
        dp[i][j]=min(dp[i][j],dp[st.top()][j] - a[st.top()] + a[i]);
        st.pop();
      }
      st.push(i);
    }
  }
  cout<<dp[n][k];
}

Compilation message (stderr)

blocks.cpp: In function 'int32_t main()':
blocks.cpp:13:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen ("blocks.inp", "r", stdin);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
blocks.cpp:14:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen ("blocks.out", "w", stdout);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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