This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX=1005;
int H,W;
ll dp[MX][MX];
int main() {
cin.tie(0); ios_base::sync_with_stdio(0);
cin>>H>>W;
vector<ll> A(H),B(W);
for(int i=0;i<H;i++) cin>>A[i];
for(int i=0;i<W;i++) cin>>B[i];
vector<pair<ll,ll>> a, b;
{
vector<bool> C(H);
int mn=2e9;
for(int i=0;i<H;i++) {
if(mn>A[i]) {
mn=A[i];
C[i]=1;
while(i+1<H && A[i+1]==A[i]) i++;
C[i]=1;
}
}
mn=2e9;
for(int i=H-1;i>=0;i--) {
if(mn>A[i]) {
mn=A[i];
C[i]=1;
while(i-1>=0 && A[i-1]==A[i]) i--;
C[i]=1;
}
}
int lst=0;
for(int i=0;i<H;i++)
if(C[i]) {
a.push_back({A[i],i-lst});
lst=i;
}
}
{
vector<bool> C(W);
int mn=2e9;
for(int i=0;i<W;i++) {
if(mn>B[i]) {
mn=B[i];
C[i]=1;
while(i+1<W && B[i+1]==B[i]) i++;
C[i]=1;
}
}
mn=2e9;
for(int i=W-1;i>=0;i--) {
if(mn>B[i]) {
mn=B[i];
C[i]=1;
while(i-1>=0 && B[i-1]==B[i]) i--;
C[i]=1;
}
}
int lst=0;
for(int i=0;i<W;i++)
if(C[i]) {
b.push_back({B[i],i-lst});
lst=i;
}
}
H=a.size();
W=b.size();
for(int i=0;i<=H;i++) {
for(int j=0;j<=W;j++) {
dp[i][j]=2e18;
}
}
dp[0][0]=0;
for(int i=0;i<H;i++) {
for(int j=0;j<W;j++) {
if(i+1<H)
dp[i+1][j]=min(dp[i+1][j],dp[i][j]+b[j].first*a[i+1].second);
if(j+1<W)
dp[i][j+1]=min(dp[i][j+1],dp[i][j]+a[i].first*b[j+1].second);
}
}
cout<<dp[H-1][W-1]<<'\n';
}
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