bac_eroziune

#include<iostream>
using namespace std;
int n, m, a[101][101], s;
int main()
{
    cin>>m>>n;
    for(int i=1; i<=m; ++i)
        for(int j=1; j<=n; ++j)
            cin>>a[i][j];
    for(int i=1; i<=m; ++i)
        for(int j=1; j<=n; ++j)
        {
            int mini=11;/// stabilesc minimul dintre vecini
            if(a[i+1][j]<mini && i+1<=m)  /// jos
                mini=a[i+1][j];
            if(a[i-1][j]<mini && i-1>=1)  /// sus
                mini=a[i-1][j];
            if(a[i][j+1]<mini && j+1<=n) /// dreapta
                mini=a[i][j+1];
            if(a[i][j-1]<mini && j-1>=1) /// stanga
                mini=a[i][j-1];
            if(a[i][j]<mini)
            {
                s+=(mini-a[i][j]);
                a[i][j]=mini;
            }
        }
    cout<<s;
    return 0;
}