Compilare: user.cpp: In function ‘int main()’: user.cpp:27:12: warning: unused variable ‘a’ [-Wunused-variable] int i, a, b; ^ user.cpp:27:15: warning: unused variable ‘b’ [-Wunused-variable] int i, a, b; ^ user.cpp:30:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &s); ^ user.cpp:32:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp:35:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &nrq); ^ user.cpp:38:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &q[i].st, &q[i].dr); ^