A lonely talk to myself. @xianminx .
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PERM ( A , k ) if ( k == n ) PRINT ( A ) for i = 1 to n SWAP ( A , i , k ) PERM ( A , k + 1 ) SWAP ( A , i , k ) PERM ( A , 1 ) DFS and stack BFS and queue vue-router 26 Sep 2018 History API 核心是使用 HTML window.history API