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COUPON--getting wrong o/p though my solution is giving the right one

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//Though I am getting the correct output it shows wrong output..someone please help

include<stdio.h>

int main() {int m,n,i,j,pp,t,k; scanf("%d",&t); while(t--) {

    scanf("%d%d",&m,&n);
    int p[m][n],d[m][n],min=0,pos=0;

    for(i=0;i<m;i++)
    for(j=0;j<n;j++)
    scanf("%d",&p[i][j]);

    for(i=0;i<m;i++)
    for(j=0;j<n;j++)
    scanf("%d",&d[i][j]);

    min=p[0][0];
    for(i=1;i<m;i++)
    {
        if(p[i][0]<min)
        {
        min=p[i][0];
        pos=i;
    }
    }
    //printf("min::%d\n",min);
    //printf("pos:%d",pos);
    i=pos;
    for(k=1;k<n;k++)
    {
        pp=p[i][k]-d[i][k-1];
        if(pp<0)
        pp=0;
            //printf("pp[%d][%d]::%d\n",i,k,pp);
        for(j=0;j<m;j++)
        {   //printf("p[%d][%d]::%d\n",j,k,p[j][k]);
            if(p[j][k]<pp)
            {
            pp=p[j][k];
            i=j;
            }
        }

            min+=pp;
            //printf("min value::%d\n",min);

        }


    printf("%d",min);
}

}


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