func-package

函数库, 面向复杂业务场景的 js 类库

机器人的运动范围X

题目描述

地上有一个m行和n列的方格。一个机器人从坐标0,0的格子开始移动,每一次只能向左,右,上,下四个方向移动一格,但是不能进入行坐标和列坐标的数位之和大于k的格子。 例如,当k为18时,机器人能够进入方格(35,37),因为3+5+3+7 = 18。但是,它不能进入方格(35,38),因为3+5+3+8 = 19。请问该机器人能够达到多少个格子?

function movingCount(threshold, rows, cols) {
var visited = [];
for (var i = 0; i < rows; i++) {
visited.push([]);
for (var j = 0; j < cols; j++) {
visited[i][j] = false;
}
}
return moveCount(threshold, rows, cols, 0, 0, visited);
}
function moveCount(threshold, rows, cols, row, col, visited) {
if (row < 0 || row == rows || col < 0 || col == cols || visited[row][col]) {
return 0;
}
var sum = 0;
var temp = row + "" + col;
for (var i = 0; i < temp.length; i++) {
sum += temp.charAt(i) / 1;
}
if (sum > threshold) {
return 0
}
visited[row][col] = true;
return 1 + moveCount(threshold, rows, cols, row, col - 1, visited) +
moveCount(threshold, rows, cols, row, col + 1, visited) +
moveCount(threshold, rows, cols, row - 1, col, visited) +
moveCount(threshold, rows, cols, row + 1, col, visited);
}
module.exports = {
movingCount : movingCount
};