Compilare: main.c: In function 'main': main.c:62:29: warning: 'cmax' may be used uninitialized in this function [-Wmaybe-uninitialized] int l,c,retval,max,lmax,cmax; ^~~~ main.c:62:24: warning: 'lmax' may be used uninitialized in this function [-Wmaybe-uninitialized] int l,c,retval,max,lmax,cmax; ^~~~ main.c:75:19: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized] mat[n+1][c] = -1; ~~~~~~~~~~~~^~~~