paths.cpp: In function 'int main()':
paths.cpp:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d%d", &n, &m, &k);
~~~~~^~~~~~~~~~~~~~~~~~~~~~
paths.cpp:12:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i = 1; i <= n; i++) scanf("%d", &col[i]), col[i]--;
~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~
paths.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &u, &v);
~~~~~^~~~~~~~~~~~~~~~