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| #include <bits/stdc++.h> #define rint register int using namespace std;
int N,M; const int INF=1<<30; int min_v[20]; int ans=INF;
void dfs(int m,int r,int h,int V,int S){ if(m==0){ if(V==N) ans=min(ans,S); return; } if(V+min_v[m]>N) return; if(S+(N-V)/r*2>ans) return; if(r<mh<m) return; rint s,v; for(rint i=r;i>=m;--i){ for(rint j=h;j>=m;--j){ v=V+i*i*j; s=S+i*2*j; if(m==M) s+=i*i; dfs(m-1,i-1,j-1,v,s); } } }
int main(){ cin>>N>>M; for(rint i=1;i<20;++i){ min_v[i]=min_v[i-1]+i*i*i; } int r=(N-min_v[M-1])/M,h=r/M; dfs(M,r,h,0,0); if(ans==INF) cout<<0; else cout<<ans; cout<<endl; return 0; }
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