election_campaign.cpp: In function 'int main(int, const char**)':
election_campaign.cpp:28:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &n);
~~~~~^~~~~~~~~~
election_campaign.cpp:31:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int u, v; scanf("%d %d", &u, &v);
~~~~~^~~~~~~~~~~~~~~~~
election_campaign.cpp:36:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d", &m);
~~~~~^~~~~~~~~~
election_campaign.cpp:39:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d", &x, &y, &c);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~