Compilare: main.cpp: In function 'void cb(int, int, int)': main.cpp:23:19: warning: unused variable 'last' [-Wunused-variable] int st=1,dr=n,last; ^~~~ main.cpp: In function 'int dfs(int)': main.cpp:40:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:72:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=sz.size()-1;i>=sz.size()-k;i--) ~^~~~~~~~~~~~~ main.cpp:49:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("banana.in","r",stdin); ^ main.cpp:50:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("banana.out","w",stdout); ^ main.cpp:51:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ main.cpp:53:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&v[i].x,&v[i].y); ^