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Update the book based on the revised second edition (#1014)

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* Revised the book

* Update the book with the second revised edition

* Revise base on the manuscript of the first edition
This commit is contained in:
Yudong Jin
2023-12-28 18:06:09 +08:00
committed by GitHub
parent 19dde675df
commit f68bbb0d59
261 changed files with 643 additions and 647 deletions
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6
codes/cpp/chapter_backtracking/n_queens.cpp
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@ -16,10 +16,10 @@ void backtrack(int row, int n, vector<vector<string>> &state, vector<vector<vect
}
// 遍历所有列
for (int col = 0; col < n; col++) {
// 计算该格子对应的主对角线和副对角线
// 计算该格子对应的主对角线和次对角线
int diag1 = row - col + n - 1;
int diag2 = row + col;
// 剪枝：不允许该格子所在列、主对角线、副对角线上存在皇后
// 剪枝：不允许该格子所在列、主对角线、次对角线上存在皇后
if (!cols[col] && !diags1[diag1] && !diags2[diag2]) {
// 尝试：将皇后放置在该格子
state[row][col] = "Q";
@ -39,7 +39,7 @@ vector<vector<vector<string>>> nQueens(int n) {
vector<vector<string>> state(n, vector<string>(n, "#"));
vector<bool> cols(n, false); // 记录列是否有皇后
vector<bool> diags1(2 * n - 1, false); // 记录主对角线上是否有皇后
vector<bool> diags2(2 * n - 1, false); // 记录副对角线上是否有皇后
vector<bool> diags2(2 * n - 1, false); // 记录次对角线上是否有皇后
vector<vector<vector<string>>> res;
backtrack(0, n, state, res, cols, diags1, diags2);