UVA - 12146 Candy ( UVALive - 4212, SPOJ - SAMER08C, Regionals 2008 >> Latin America - South America)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / uva / uvalive / spoj), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

#include<bits/stdc++.h>
using namespace std;

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100010

int m, dp[MX], row[MX], arr[MX];

int func(int pos)
{
    if(pos>=m) return 0;
    int &ret = dp[pos];
    if(ret!=-1) return ret;
    ret = max(func(pos+1), func(pos+2)+arr[pos]);
return ret;
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int tc, kk=1, n;
    string s;
    char ch;
    while(cin>>n>>m && n)
    {
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<m;j++)
                cin>>arr[j], dp[j]=-1;
            //SET(dp);
            row[i]=func(0);
        }
        //SET(dp);
        for(int i=0;i<n;i++)
            arr[i]=row[i], dp[i]=-1;
        m=n;
        cout<< func(0) <<"\n";
    }
return 0;
}