foo.cc: In function 'int main()':
foo.cc:5:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(ch);  //用cin只有8分
         ^
In file included from /usr/include/stdio.h:862:0,
                 from /usr/include/c++/7/cstdio:42,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:46,
                 from foo.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:232:1: note: declared here
 gets (char *__str)
 ^~~~
foo.cc:9:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=0;i<ll;i++)
     ^~~
foo.cc:11:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  return 0;
  ^~~~~~
foo.cc:5:6: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result [-Wunused-result]
  gets(ch);  //用cin只有8分
  ~~~~^~~~
/tmp/cc0CHIXV.o: In function `main':
foo.cc:(.text.startup+0x27): warning: the `gets' function is dangerous and should not be used.

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