Compilare: user.cpp: In function ‘int main()’: user.cpp:46:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<New[i].size();j++) ^ user.cpp: In function ‘int Query(int)’: user.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:31:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(IN,"%d %s",&K,str+1); ^