二维数组之最大联通和（联通涂色问题） beta！

#include<iostream>
using namespace std;


/*int yiwei_max(int n,int a[],int *p,int *q)
{
     int temp=0,sum=-999999999,timer=-1;
     for(int i=0;i<n;i++)
     {
         if(temp>0)
         {
             temp+=a[i];
         }
         else 
         {
             temp=a[i];
         }
         if(temp>sum) 
         {
             sum=temp;
             *q=i;
             timer++;
         }
     }
     *p=*q-timer;
     return sum;  
}*/



int max_sum(int n,int a[],int *besti,int *bestj)
{
     int *b = (int *)malloc(n * sizeof(int));
     int sum = 0;
     int i = -1;
     int temp = 0;

     for (i=0;i<=n-1;i++) 
     {
          if (temp > 0)
          {
              temp += a[i];
          }
          else
          {
              temp = a[i];
          }
          b[i] = temp;
     }
     sum = b[0];
     for (i=1;i<=n-1;i++) 
     {
         if (sum < b[i]) 
         {
             sum = b[i];
             *bestj = i;
         }
     } 
    for (i = *bestj;i >= 0;i--) 
    {
        if (b[i] == a[i]) 
        {
             *besti = i;
             break;
        }
    }
    free(b);
    return sum; 
}



void main()
{
    int a[100][100],b[100];
    int up[100],down[100],t[100];
    int i,j,m,n,x,y;
    int temp,t2;
    int l=0,u=0,l_down,l_up,n_down,n_up;
    int s;

    cout<<"几行几列？"<<endl;
    cin>>m>>n;
    for(i=0;i<m;i++)
    {
         for(j=0;j<n;j++)
         {
              cin>>a[i][j];
         }
    }

    for(i=0;i<m;i++)
    {
        for(j=0;j<n;j++)
        {
            b[j]=a[i][j];
        }
        //temp=yiwei_max(n,b,&x,&y);
        temp=max_sum(n,b,&x,&y);
        up[i]=x;
        down[i]=y;
        t[i]=temp;
    }

    t2=t[0];
    for(i=0;i+1<m;i++)
    {
        if(up[i]<=down[i+1] && down[i]>=up[i+1])
        {
            t2+=t[i+1];
        }
        else
        {
            l_down=down[i];
            l_up=up[i];
            n_up=up[i+1];
            n_down=down[i+1];
            
            if(down[i]<up[i+1])
            {
                for(;l_down!=up[i+1];)
                {
                    l+=a[i][++l_down];        
                }
                
                for(;n_up!=down[i];)
                {
                    u+=a[i+1][--n_up];
                }
            }
            if(up[i]>down[i+1])
            {
                for(;l_up!=down[i+1];)
                {
                    l+=a[i][--l_up];        
                }

                for(;n_down!=up[i];)
                {
                    u+=a[i+1][++n_down];
                }
            }
            
            s=l>u?l:u;

            if(s+t[i+1]>0)
            {
                t2+=t[i+1]+s;
            }
        }
    }
    cout<<t2<<endl;
}