Function sp_npos_elections::pjr::validate_pjr_challenge

pub fn validate_pjr_challenge<AccountId: IdentifierT>(
    counter_example: AccountId,
    supports: &Supports<AccountId>,
    all_candidates: Vec<AccountId>,
    all_voters: Vec<(AccountId, VoteWeight, Vec<AccountId>)>
) -> bool

Validate a challenge to an election result.

A challenge to an election result is valid if there exists some counter_example for which pre_score(counter_example) >= threshold. Validating an existing counter_example is computationally cheaper than re-running the PJR check.

This function uses the standard threshold.

Returns true if the challenge is valid: the proposed solution does not satisfy PJR. Returns false if the challenge is invalid: the proposed solution does in fact satisfy PJR.