Compilare: user.cpp: In function ‘int main()’: user.cpp:9:13: warning: unused variable ‘x’ [-Wunused-variable] int n, s, x, ans; ^ user.cpp:11:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:14:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", v + i); ^ user.cpp:33:16: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (ans <= s - ans) { ^