joi2019_ho_t3.cpp: In function 'int main()':
joi2019_ho_t3.cpp:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &n, &m);
~~~~~^~~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:15:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i = 0; i < n; i++) scanf("%d%d", &a[i].y, &a[i].x);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t3.cpp:17:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
for(int i = 0; i < m; i++) scanf("%d", c + i);
~~~~~^~~~~~~~~~~~~