Compilare: main.cpp: In function 'void solve()': main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<events.size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:64:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pudge.in","r",stdin); ^ main.cpp:65:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pudge.out","w",stdout); ^ main.cpp:66:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld",&X,&Y,&D); ^ main.cpp:70:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:74:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&x0[i],&v[i]); ^