Compilare: user.cpp: In function ‘int main()’: user.cpp:10:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:12:33: 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:31:23: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=l, j=r+1; j<n; i++, j++){ ^ user.cpp:34:13: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] n-=r-l+1; ^