Compilare: user.cpp: In function ‘int main()’: user.cpp:17:25: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[1000000]’ [-Wformat=] fscanf ( f, "%s", &s); ^ user.cpp:15:19: warning: unused variable ‘x’ [-Wunused-variable] int i, top=0, x, ok = 0; ^ user.cpp:16:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f, "%d %d", &n, &m); ^ user.cpp:17:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f, "%s", &s); ^