coach.cpp: In function 'void init()':
coach.cpp:18:46: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%d%d%d%lld", &x, &n, &m, &w, &t);
                                              ^
coach.cpp:19:52: 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("%lld", &s[i]);
                                                    ^
coach.cpp:22:80: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   for (int i = 1; i <= m; ++i) scanf("%lld%d", &info[i].first, &info[i].second);
                                                                                ^