friend.cpp: In function 'int main()':
friend.cpp:39:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
39 | scanf("%d", &n);
| ~~~~~^~~~~~~~~~
friend.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | scanf("%d", &confidence[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~
friend.cpp:44:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
44 | scanf("%d %d", &host[i], &protocol[i]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccJX5lmW.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccUUMXrY.o:friend.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccJX5lmW.o:(.bss+0xc3540): multiple definition of `confidence'; /tmp/ccUUMXrY.o:(.bss+0xdb720): first defined here
/usr/bin/ld: /tmp/ccJX5lmW.o:(.bss+0x0): multiple definition of `protocol'; /tmp/ccUUMXrY.o:(.bss+0x20): first defined here
/usr/bin/ld: /tmp/ccJX5lmW.o:(.bss+0x61aa0): multiple definition of `host'; /tmp/ccUUMXrY.o:(.bss+0x6dba0): first defined here
/usr/bin/ld: /tmp/ccJX5lmW.o: in function `main':
grader.cpp:(.text.startup+0xdd): undefined reference to `findSample(int, int*, int*, int*)'
collect2: error: ld returned 1 exit status