Compilare: user.c: In function ‘flip’: user.c:23:13: warning: implicit declaration of function ‘flip2’ [-Wimplicit-function-declaration] max=flip2(a,n,m,max,0); ^ user.c:40:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘flip2’: user.c:75:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:82:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%i%i",&n,&m); ^ user.c:93:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%i",&tb[i][j]); ^