Submission #1101631

#TimeUsernameProblemLanguageResultExecution timeMemory
1101631ngongocbichK blocks (IZhO14_blocks)C++17
0 / 100
11 ms82684 KiB
#include <bits/stdc++.h> #define int long long #define mask(k) (1<<(k)) using namespace std; int n,k,a[100001],dp[100001][101],l[100001],mx[100001][21]; stack<int> st; int getmn(int l, int r) { int p=__lg(r-l+1); return min(mx[l][p],mx[r-mask(p)+1][p]); } signed main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); //freopen("kblocks.inp","r",stdin); //freopen("kblocks.out","w",stdout); cin>>n>>k; for (int i=1; i<=n; i++) cin>>a[i]; for (int i=1; i<=n; i++) { while (!st.empty() && a[st.top()]<=a[i]) st.pop(); if (!st.empty()) l[i]=st.top(); else l[i]=0; st.push(i); } memset(dp,0x3f,sizeof(dp)); dp[0][0]=0; for (int j=1; j<=k; j++) { for (int i=0; i<=n; i++) mx[i][0]=dp[i][j-1]; for (int j=1; mask(j)<=n+1; j++) for (int i=0; i+mask(j)-1<=n; i++) mx[i][j]=min(mx[i][j-1],mx[i+mask(j-1)][j-1]); for (int i=1; i<=n; i++) { dp[i][j]=min(dp[i][j],getmn(l[i],i)+a[i]); dp[i][j]=min(dp[i][j],dp[l[i]][j]); } } cout<<dp[n][k]; return 0; }
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