Compilare: user.cpp: In function ‘int main()’: user.cpp:71:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(S); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:71:9: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(S); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:71:15: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(S); ^ In file included from /usr/include/c++/5/cstdio:42:0, from user.cpp:1: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^ user.cpp:67:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &N, &M); ^ user.cpp:71:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ /tmp/cc1hkY8O.o: In function `main': user.cpp:(.text.startup+0x49): warning: the `gets' function is dangerous and should not be used.