Compilare: main.cpp: In function 'int main()': main.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(register int i=0;i<v.size();i++) ~^~~~~~~~~ main.cpp:80:37: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::vector<ans>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n%d\n",cost,an.size()); ^ main.cpp:81:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(register int i=0;i<an.size();i++) ~^~~~~~~~~~ main.cpp:46:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ main.cpp:47:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ main.cpp:49:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ main.cpp:52:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&x1,&x2); ^