Compilare: user.cpp: In function ‘int main()’: user.cpp:16:21: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[1000005]’ [-Wformat=] fscanf(f,"%s",&a); ^ user.cpp:12:13: warning: variable ‘mx’ set but not used [-Wunused-but-set-variable] int i,j,mx,mn; ^ user.cpp:12:16: warning: unused variable ‘mn’ [-Wunused-variable] int i,j,mx,mn; ^ user.cpp:15:28: 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:16:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%s",&a); ^