detect impossible puzzle
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855472e42a
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2f3555b303
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@ -47,6 +47,8 @@ fn main() {
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if let Err(reason) = solver.solve(args.limit) {
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println!("{}", reason);
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solver.display(solver::ui::DisplayMode::Full);
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if args.debug {
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solver.display(solver::ui::DisplayMode::Full);
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}
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}
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}
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@ -57,6 +57,10 @@ impl Cell {
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}
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}
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pub fn get_state(&self) -> Option<usize> {
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self.state
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}
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pub fn get_allowed(&self) -> Vec<usize> {
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self.blocking_states
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.iter()
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@ -107,16 +111,19 @@ impl Cell {
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}
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pub fn remove_allowed(&mut self, blocking_cells: &Vec<BlockingCell>) -> Result<RemoveResult, CellError> {
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if !self.state.is_none() {
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return Ok(RemoveResult::Filled)
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}
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for blocking_cell in blocking_cells {
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if let Some(blocking) = self.blocking_states.get_mut(&blocking_cell.state) {
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blocking.push(blocking_cell.position);
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}
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}
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if let Some(state) = self.state {
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if self.blocking_states[&state].len() > 0 {
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return Err(CellError::StateNotAllowed)
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}
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return Ok(RemoveResult::Filled)
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}
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let allowed_states = self.get_allowed();
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match allowed_states.len() {
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@ -15,7 +15,7 @@ impl fmt::Display for WaveError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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WaveError::Contradiction => write!(f, "Error: The puzzle contradicts itself."),
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WaveError::NoHistory => write!(f, "Error: Tried to backtrack but the History is empty."),
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WaveError::NoHistory => write!(f, "Error: The puzzle is impossible (backtracked to start)."),
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}
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}
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}
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