Compilare: main.cpp: In function 'int main()': main.cpp:61:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(register int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:42:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm2.in","r",stdin); ^ main.cpp:43:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm2.out","w",stdout); ^ main.cpp:45:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ main.cpp:48:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&x1,&x2); ^ main.cpp:78:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&x1); ^