calc.js

const blocks = [
  [
    [
      [1, 1],
      [1, 1]
    ]
  ],
  [
    [
      [2, 2, 2, 2]
    ],
    [
      [2],
      [2],
      [2],
      [2]
    ]
  ],
  [
    [
      [3, 3, 0],
      [0, 3, 3]
    ],
    [
      [0, 3],
      [3, 3],
      [3, 0]
    ]
  ],
  [
    [
      [0, 4, 4],
      [4, 4, 0]
    ],
    [
      [4, 0],
      [4, 4],
      [0, 4]
    ]
  ],
  [
    [
      [5, 0, 0],
      [5, 5, 5]
    ],
    [
      [5, 5],
      [5, 0],
      [5, 0]
    ],
    [
      [5, 5, 5],
      [0, 0, 5]
    ],
    [
      [0, 5],
      [0, 5],
      [5, 5]
    ]
  ],
  [
    [
      [0, 0, 6],
      [6, 6, 6]
    ],
    [
      [6, 6],
      [0, 6],
      [0, 6]
    ],
    [
      [6, 6, 6],
      [6, 0, 0]
    ],
    [
      [6, 0],
      [6, 0],
      [6, 6]
    ]
  ],
  [
    [
      [0, 7, 0],
      [7, 7, 7]
    ],
    [
      [7, 7, 7],
      [0, 7, 0]
    ],
    [
      [7, 0],
      [7, 7],
      [7, 0]
    ],
    [
      [0, 7],
      [7, 7],
      [0, 7]
    ]
  ],
  [
    [
      [0, 8, 0],
      [8, 8, 8],
      [0, 8, 0]
    ]
  ],
  [
    [
      [9]
    ]
  ],
  [
    [
      [10, 10]
    ],
    [
      [10],
      [10]
    ]
  ],
  [
    [
      [11, 11],
      [11, 0],
    ],
    [
      [11, 11],
      [0, 11],
    ],
    [
      [0, 11],
      [11, 11],
    ],
    [
      [11, 0],
      [11, 11],
    ],
  ],
];

let m, n, a, l, res;

function Solve(arr, num) {
  res = [];
  m = arr.length;
  n = arr[0].length;

  a = new Array(m);
  for (let i = 0; i < m; ++i) {
    a[i] = arr[i].map(x => x);
  }

  l = num.map(x => x);

  dfs(0);

  return res;
}

function canPlaceBlock(x, y, b, d) {
  const pat = blocks[b][d];
  let offset = 0;
  while (!pat[0][offset]) ++offset;
  y -= offset;
  if (y < 0) return false;
  for (let i = 0; i < pat.length; ++i) {
    for (let j = 0; j < pat[0].length; ++j) {
      if (pat[i][j] && (x + i >= m || y + j >= n || a[x + i][y + j] !== -1)) return false;
    }
  }
  return true;
}

function placeBlock(x, y, b, d, v) {
  const pat = blocks[b][d];
  let offset = 0;
  while (!pat[0][offset]) ++offset;
  y -= offset;
  for (let i = 0; i < pat.length; ++i) {
    for (let j = 0; j < pat[0].length; ++j) {
      if (pat[i][j]) a[x + i][y + j] = v;
    }
  }
}

function dfs(p) {
  if (p === m * n) {
    const x = new Array(m);
    for (let i = 0; i < m; ++i) {
      x[i] = a[i].map(x => x);
    }
    res.push(x);
    if (res.length >= 10000) {
      alert('方案数太多，仅计算前一万种。减少一些方块吧~');
      return true;
    }
    return false;
  }
  const x = Math.floor(p / n), y = p % n;
  if (a[x][y] !== -1) {
    if (dfs(p + 1)) return true;
    return false;
  }
  for (let b = 0; b < blocks.length; ++b) {
    if (!l[b]) continue;
    for (let d = 0; d < blocks[b].length; ++d) {
      if (!canPlaceBlock(x, y, b, d)) continue;
      placeBlock(x, y, b, d, b + 1);
      --l[b];
      if (dfs(p + 1)) return true;
      ++l[b];
      placeBlock(x, y, b, d, -1);
    }
  }
  return false;
}