Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:119:6: warning: unused variable ‘iq’ [-Wunused-variable] int iq; ^ user.cpp:127:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d ", &N, &Q); ^ user.cpp:150:25: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(buf, 2000000, fi); ^