Compilare: user.cpp: In function ‘void bkt(int, int, int)’: user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v.size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:55:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fs(f,"%d %c %d",&n,&c,&x); ^