Compilare: user.cpp: In function ‘int main()’: user.cpp:53:31: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[50005]’ [-Wformat=] scanf("%s\n%s\n",&ch1,&ch2); ^ user.cpp:53:31: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[50005]’ [-Wformat=] user.cpp:51:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("swap.in" ,"r" ,stdin); ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("swap.out","w" ,stdout); ^ user.cpp:53:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n%s\n",&ch1,&ch2); ^