+bool Board::operator==(const Board& o) const {
+ for (int i = 0; i < BOARD_SIZE; i++) {
+ if (board[i] != o.board[i]) {
+ return false;
+ }
+ }
+ return true;
+}
+
+bool Board::operator!=(const Board& o) const {
+ return !operator==(o);
+}
+
+bool Board::operator<(const Board& o) const {
+ for (int i = 0; i < BOARD_SIZE; i++) {
+ if (board[i] < o.board[i]) {
+ return true;
+ } else if (board[i] > o.board[i]) {
+ return false;
+ }
+ }
+ return false;
+}
+