我试图编写一个函数,该函数将在多维数组(值从3到7)中找到,将值重复至少3次(垂直和水平)。如果找到了,请将其更改为其他值。假设1。
我尝试通过循环执行此操作,但这似乎不是解决该问题的好方法,否则我将其弄乱了。因为对于某些数组,它起作用,对于某些数组,它不起作用。
这是我的代码:
function searching(array) {
for (i = 0; i < array.length; i++) {
let horizontal = array[i][0];
let howMany = 1;
for (j = 1; j < array[i].length; j++) {
if (horizontal === array[i][j]) {
howMany += 1;
horizontal = array[i][j];
if (howMany >= 3) {
for (d = j; d > j - howMany; d--) {
array[i][d] = 0;
}
}
} else {
horizontal = array[i][j];
howMany = 1;
}
}
}
for (v = 0; v < array.length; v++) {
let vertical = array[0][v];
let howMany = 1;
for (x = 1; x < array.length; x++) {
if (vertical === array[x][v]) {
howMany++;
vertical = array[x][v];
if (howMany >= 3) {
for (d = x; d > x - howMany; d--) {
array[d][v] = 0;
}
}
} else {
vertical = array[x][v];
howMany = 1;
}
}
}
}
这个想法是例如给数组:
let array = [
[3, 4, 5, 6, 7],
[3, 4, 5, 6, 7],
[3, 4, 5, 5, 5],
[3, 5, 6, 7, 4]
]
结果应该是:
let result = [
[1, 1, 1, 6, 7],
[1, 1, 1, 6, 7],
[1, 1, 1, 1, 1],
[1, 5, 6, 7, 4]
]
在此先感谢您解决问题的任何想法:)问候!
答案 0 :(得分:0)
我一开始不明白这个问题... 这是我的代码:
let array = [
[3, 4, 5, 6, 7],
[3, 4, 5, 6, 7],
[3, 4, 5, 5, 5],
[3, 5, 6, 7, 4]
];
function replace(arr, target = 1) {
let needToChange = []; // save the index to change
const numbers = [3, 4, 5, 6, 7];
const m = arr.length; // m rows
const n = arr[0].length; // n columns
let mi = 0;
let ni = 0;
// search in row
for (mi = 0; mi < m; mi++) {
for (let x = 0; x < numbers.length; x++) {
const num = numbers[x]; // number to search
let counter = 0; // counter for this number in row mi
let tempArr = [];
for (ni = 0; ni < n; ni++) {
const currentNum = arr[mi][ni];
if (currentNum === num) {
counter++;
tempArr.push([mi, ni]);
}
}
if (counter >= 3) {
needToChange = needToChange.concat(tempArr);
}
}
}
// search in column
for (ni = 0; ni < n; ni++) {
for (let x = 0; x < numbers.length; x++) {
const num = numbers[x]; // number to search
let counter = 0; // counter for this number in row mi
let tempArr = [];
for (mi = 0; mi < m; mi++) {
const currentNum = arr[mi][ni];
if (currentNum === num) {
counter++;
tempArr.push([mi, ni]);
}
}
if (counter >= 3) {
needToChange = needToChange.concat(tempArr);
}
}
}
// replace
needToChange.forEach(([i, j]) => {
array[i][j] = target;
});
}
replace(array);
array.forEach(row => {
console.log(row.join(', '));
})
答案 1 :(得分:0)
您当前代码的问题是
(1)您仅检查单个行和列,当您需要同时检查它们时(例如,使用[[2, 2], [2, 5]]
,当在起始位置[0][0]
时,您需要查看[0][1]
(如果匹配,还包括其邻居)以及[1][0]
(如果匹配,则及其邻居)。
(2)目前,您实际上并没有检查邻接关系,只是在计算特定行或列中匹配元素的总数。
遍历数组的所有索引。如果已经检查了索引,请尽早返回。递归搜索该索引的邻居,如果总共找到至少3个匹配项,请将它们全部设置为1。将所有匹配的邻居放入checked
集中,以避免再次检查它们(即使少于2个)总共找到了相邻的匹配项。
setAllAdjacentToOne([
[3, 4, 5, 6, 7],
[3, 4, 5, 6, 7],
[3, 4, 5, 5, 5],
[3, 5, 6, 7, 4]
]);
// all 9s stay, the rest get set to 1:
setAllAdjacentToOne([
[2, 2, 9, 7, 7],
[2, 9, 9, 9, 7],
[3, 4, 4, 5, 5],
[9, 4, 5, 5, 9]
]);
function setAllAdjacentToOne(input) {
const output = input.map(subarr => subarr.slice());
const checked = new Set();
const getKey = (x, y) => `${x}_${y}`;
const width = input[0].length;
const height = input.length;
const getAllAdjacent = (x, y, numToFind, matches = []) => {
if (x >= width || x < 0 || y >= height || y < 0) {
return matches;
}
const key = getKey(x, y);
if (!checked.has(key) && input[y][x] === numToFind) {
checked.add(key);
matches.push({ x, y });
getAllAdjacent(x + 1, y, numToFind, matches);
getAllAdjacent(x - 1, y, numToFind, matches);
getAllAdjacent(x, y + 1, numToFind, matches);
getAllAdjacent(x, y - 1, numToFind, matches);
}
return matches;
};
output.forEach((innerRowArr, y) => {
innerRowArr.forEach((num, x) => {
const allAdjacent = getAllAdjacent(x, y, num);
if (allAdjacent.length <= 2) {
return;
}
allAdjacent.forEach(({ x, y }) => {
output[y][x] = 1;
});
});
});
console.log(JSON.stringify(output));
}