Compilare: user.cpp: In function ‘int main()’: user.cpp:17:8: warning: unused variable ‘l’ [-Wunused-variable] int e,l,min=1<<31,left=0,right=0,c_s=0,sgn; ^ user.cpp:14:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d", &N, &K); ^ user.cpp:16:23: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(c, 3000101, in); ^