foo.cc: In function 'int main()':
foo.cc:72:17: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         gets(str);
                 ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/c++/7/ext/string_conversions.h:43,
                 from /usr/include/c++/7/bits/basic_string.h:6361,
                 from /usr/include/c++/7/string:52,
                 from /usr/include/c++/7/stdexcept:39,
                 from /usr/include/c++/7/array:39,
                 from /usr/include/c++/7/tuple:39,
                 from /usr/include/c++/7/bits/stl_map.h:63,
                 from /usr/include/c++/7/map:61,
                 from foo.cc:9:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:68:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&n,&p);
     ~~~~~^~~~~~~~~~~~~~
foo.cc:72:13: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
         gets(str);
         ~~~~^~~~~
/tmp/cctsZRV8.o: In function `main':
foo.cc:(.text.startup+0x9b): warning: the `gets' function is dangerous and should not be used.

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