Compilare: user.cpp: In function ‘int main()’: user.cpp:11:5: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a);gets(b); ^~~~ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:11:11: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a);gets(b); ^ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:11:13: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a);gets(b); ^~~~ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:11:19: warning: ‘char* gets(char*)’ is deprecated [-Wdeprecated-declarations] gets(a);gets(b); ^ In file included from user.cpp:1:0: /usr/include/stdio.h:638:14: note: declared here extern char *gets (char *__s) __wur __attribute_deprecated__; ^~~~ user.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<(nr<1000?nr:1000);i++) printf("%d ",sol[i]); ~^~~~~~~~~~~~~~~~~~ user.cpp:9:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] { freopen("strmatch.in","r",stdin); ^ user.cpp:10:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out","w",stdout); ^ user.cpp:11:12: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a);gets(b); ^ user.cpp:11:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(a);gets(b); ^ /tmp/ccyavUPh.o: In function `main': user.cpp:(.text.startup+0x49): warning: the `gets' function is dangerous and should not be used.