/tmp/ccwraUcU.o: In function `main':
grader_jeehak.c:(.text.startup+0x12a): undefined reference to `jeehak(int*)'
collect2: ld returned 1 exit status
friends.cpp: In function 'int friends(int*, int, int*, int*)':
friends.cpp:6:1: warning: no return statement in function returning non-void [-Wreturn-type]
grader_friends.c: In function 'int main()':
grader_friends.c:46:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
grader_friends.c:52:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
grader_friends.c:53:68: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
grader_friends.c: At global scope:
grader_friends.c:18:12: warning: '__now__' defined but not used [-Wunused-variable]
/tmp/ccWZyl7c.o: In function `main':
grader_friends.c:(.text.startup+0x253): undefined reference to `friends(int*, int, int*, int*)'
collect2: ld returned 1 exit status