int a[3][4]={{1,2,3,4},{5,6,7,8,9},{10,11,12,13}};
int a[3][4]={{1,2,3,4},{5,6,7,8,9},{10,11,12,13},{1,2}};
int a[3][4]={{1,2,3,4},{},{10,11,12,13}};
int a[3][4]={1,2,3,4},{5,6,7,8,},{10,