/in/foo.c: In function 'main':
/in/foo.c:22:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(j=m*n-1; j>i; j--)
   ^~~
/in/foo.c:30:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
    if(flag==1)
    ^~