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lc909_蛇梯棋 struct-python包 vscode 切换选中文字的大小写的快捷键 CVAL,PVAL,SVAL宏定义

Algorithm

lc909_蛇梯棋

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// 题意难懂，直接看题解锻炼思维吧
// 简单的bfs，主要是题意离谱
class Solution {
    pair<int, int> id2rc(int id, int n) {
        int r = (id - 1) / n, c = (id - 1) % n;
        if (r % 2 == 1) {
            c = n - 1 - c;
        }
        return {n - 1 - r, c};
    }

public:
    int snakesAndLadders(vector<vector<int>> &board) {
        int n = board.size();
        vector<int> vis(n * n + 1);
        queue<pair<int, int>> q;
        q.emplace(1, 0);
        while (!q.empty()) {
            auto p = q.front();
            q.pop();
            for (int i = 1; i <= 6; ++i) {
                int nxt = p.first + i;
                if (nxt > n * n) { // 超出边界
                    break;
                }
                auto rc = id2rc(nxt, n); // 得到下一步的行列
                if (board[rc.first][rc.second] > 0) { // 存在蛇或梯子
                    nxt = board[rc.first][rc.second];
                }
                if (nxt == n * n) { // 到达终点
                    return p.second + 1;
                }
                if (!vis[nxt]) {
                    vis[nxt] = true;
                    q.emplace(nxt, p.second + 1); // 扩展新状态
                }
            }
        }
        return -1;
    }
};

// 作者：LeetCode-Solution
// 链接：https://leetcode-cn.com/problems/snakes-and-ladders/solution/she-ti-qi-by-leetcode-solution-w0vl/

Review

struct python包
https://docs.python.org/3/library/struct.html#format-characters

Struct is a good tool to handle the binary file.

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vscode 切换选中文字的大小写的快捷键

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CVAL,PVAL,SVAL宏定义