/in/foo.c: In function 'main':
/in/foo.c:6:2: warning: 'gets' is deprecated [-Wdeprecated-declarations]
  gets(s);
  ^~~~
In file included from /in/foo.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.c:21:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(t[i]=='+')
   ^~
/in/foo.c:23:4: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    m2=a[i];
    ^~
/in/foo.c:5:21: warning: unused variable 'j' [-Wunused-variable]
  int a[10000]={0},i,j=0,k=0,r=1,m1=0,m2=0;
                     ^
/tmp/cccueAyl.o: In function `main':
foo.c:(.text.startup+0x4c): warning: the `gets' function is dangerous and should not be used.