Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:142:6: warning: unused variable ‘sz’ [-Wunused-variable] int sz = 2000000; ^ user.cpp:126:30: 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:148:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d", A + i); ^ user.cpp:158:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi, "%d %d", &(q[i].a), &(q[i].b)); ^