Compilare: user.c: In function ‘main’: user.c:27:5: warning: implicit declaration of function ‘strlen’ [-Wimplicit-function-declaration] n=strlen(s1); ^ user.c:27:7: warning: incompatible implicit declaration of built-in function ‘strlen’ [enabled by default] n=strlen(s1); ^ user.c:29:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] {v1[s1[j]]++; ^ user.c:30:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] v2[s2[j]]++;} ^ user.c:23:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&T); ^ user.c:26:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s%s",s1,s2); ^