Compilare: user.c: In function ‘main’: user.c:21:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&n,&m); ^ user.c:78:18: warning: ‘jc’ may be used uninitialized in this function [-Wmaybe-uninitialized] marc2[jl][jc]=-1; ^ user.c:78:18: warning: ‘jl’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.c:58:18: warning: ‘rc’ may be used uninitialized in this function [-Wmaybe-uninitialized] marc1[rl][rc]=-1; ^ user.c:58:18: warning: ‘rl’ may be used uninitialized in this function [-Wmaybe-uninitialized]