Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:98:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp:107:30: 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:118:27: 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:121:44: 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)); ^