Compilare: user.cpp: In function ‘void buildS(char*, char*, int*)’: user.cpp:19:22: warning: operation on ‘* n’ may be undefined [-Wsequence-point] s[*n] = a[(*n)++]; ^ user.cpp: In function ‘int main()’: user.cpp:57:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d\n", &T); ^ user.cpp:59:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a, MAX_LEN + 2, f); ^ user.cpp:60:29: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(b, MAX_LEN + 2, f); ^