Function make_hint 

pub fn make_hint(z: i32, r: i32, gamma2: i32) -> i32

Compute a single hint bit.

Implements Algorithm 39 of FIPS 204 (MakeHint). Returns 1 if adding z to r changes the high bits (i.e., HighBits(r + z) != HighBits(r)), and 0 otherwise. The hint allows the verifier to recover w1 without knowing the secret low-order information.

• z: perturbation value (typically -ct0[i][j]).
• r: base value (typically (w - cs2 + ct0)[i][j]).
• gamma2: decomposition parameter.