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Update n_queens code.

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krahets
2023-06-21 02:56:28 +08:00
parent ba1e5c1d7d
commit 9fc1a0b2b3
8 changed files with 16 additions and 16 deletions
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4
codes/cpp/chapter_backtracking/n_queens.cpp
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@ -19,8 +19,8 @@ void backtrack(int row, int n, vector<vector<string>> &state, vector<vector<vect
// 计算该格子对应的主对角线和副对角线
int diag1 = row - col + n - 1;
int diag2 = row + col;
// 剪枝：不允许该格子所在 (列 或 主对角线 或 副对角线) 包含皇后
if (!(cols[col] || diags1[diag1] || diags2[diag2])) {
// 剪枝：不允许该格子所在列、主对角线、副对角线存在皇后
if (!cols[col] && !diags1[diag1] && !diags2[diag2]) {
// 尝试：将皇后放置在该格子
state[row][col] = "Q";
cols[col] = diags1[diag1] = diags2[diag2] = true;