grader.c: In function 'int main()':
grader.c:48:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf ("%d%d%d%d", &N, &a, &b, &M);
~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
grader.c:51:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &distance[u][v]);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~
/tmp/ccvOeyef.o: In function `main':
grader.c:(.text.startup+0xa3): undefined reference to `findRoute(int, int, int)'
collect2: error: ld returned 1 exit status