Compilare: user.cpp: In function ‘int querry(int, int, int)’: user.cpp:54:9: warning: unused variable ‘mid’ [-Wunused-variable] int mid = (low + high)/2; ^ user.cpp: In function ‘int main()’: user.cpp:62:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y, test; ^ user.cpp:67:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &m); ^ user.cpp:69:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &a[i]); ^ user.cpp:74:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &test); ^ user.cpp:76:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^ user.cpp:82:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &x, &y); ^