我有一个带有字符串的数组,我想对角线遍历 假设:
矩阵看起来像这样:
A B C D
E F G H
I J K L
我想(从左上角到右下角):
A
EB
IFC
JGD
KH
L
和(从左下角到右上角):
I
JE
KFA
LGB
HC
D
我已经有一段代码可以工作3/4,但我似乎无法弄清楚我在做什么(错误)。
//the array
var TheArray = ['ABCD','EFGH','IJKL'];
//amount of rows
var RowLength = TheArray.length;
//amount of colums
var ColumnLength = TheArray[0].length;
我已经将对角线切入这些循环中的4个以获得所有对角线。对于循环,它看起来是2,而if不循环未绑定的值。伪代码看起来有点像这样:
for(loop rows){
var outputarray = [];
for(loop columns){
if(delimit for out of bound){
var temprow = TheArray[something?];
var tempvalue = temprow[something?];
outputarray.push(tempvalue);
}
}
//use values
document.getElementById("theDiv").innerHTML += outputarray.join("")+"<br>";
}
我希望有人能帮助我。
答案 0 :(得分:17)
var array = ["ABCD","EFGH","IJKL"];
var Ylength = array.length;
var Xlength = array[0].length;
var maxLength = Math.max(Xlength, Ylength);
var temp;
for (var k = 0; k <= 2 * (maxLength - 1); ++k) {
temp = [];
for (var y = Ylength - 1; y >= 0; --y) {
var x = k - y;
if (x >= 0 && x < Xlength) {
temp.push(array[y][x]);
}
}
if(temp.length > 0) {
document.body.innerHTML += temp.join('') + '<br>';
}
}
(另见this Fiddle)
var array = ["ABCD","EFGH","IJKL"];
var Ylength = array.length;
var Xlength = array[0].length;
var maxLength = Math.max(Xlength, Ylength);
var temp;
for (var k = 0; k <= 2 * (maxLength - 1); ++k) {
temp = [];
for (var y = Ylength - 1; y >= 0; --y) {
var x = k - (Ylength - y);
if (x >= 0 && x < Xlength) {
temp.push(array[y][x]);
}
}
if(temp.length > 0) {
document.body.innerHTML += temp.join('') + '<br>';
}
}
(另见this Fiddle)
由于两者之间只有一条差异线,因此您可以轻松地将它们组合在一个函数中:
var array = ["ABCD","EFGH","IJKL"];
function diagonal(array, bottomToTop) {
var Ylength = array.length;
var Xlength = array[0].length;
var maxLength = Math.max(Xlength, Ylength);
var temp;
var returnArray = [];
for (var k = 0; k <= 2 * (maxLength - 1); ++k) {
temp = [];
for (var y = Ylength - 1; y >= 0; --y) {
var x = k - (bottomToTop ? Ylength - y : y);
if (x >= 0 && x < Xlength) {
temp.push(array[y][x]);
}
}
if(temp.length > 0) {
returnArray.push(temp.join(''));
}
}
return returnArray;
}
document.body.innerHTML = diagonal(array).join('<br>') +
'<br><br><br>' +
diagonal(array, true).join('<br>');
(另见this Fiddle)
答案 1 :(得分:5)
这样做,并将所需的结果输出到屏幕:
var array = ['ABCD','EFGH','IJKL'];
var rows = array.length;
var cols = array[0].length;
for (var n = 0; n < cols + rows - 1; n += 1)
{
var r = n;
var c = 0;
var str = '';
while (r >= 0 && c < cols)
{
if (r < rows)
str += array[r][c];
r -= 1;
c += 1;
}
document.write(str+"<br>");
}
结果:
A
EB
IFC
JGD
KH
L
答案 2 :(得分:3)
又一个解决方案:
function getAllDiagonal(array) {
function row(offset) {
var i = array.length, a = '';
while (i--) {
a += array[i][j + (offset ? offset - i : i)] || '';
}
return a;
}
var result = [[], []], j;
for (j = 1 - array.length; j < array[0].length; j++) {
result[0].push(row(0));
result[1].push(row(array.length - 1));
}
return result;
}
var array = ['ABCD', 'EFGH', 'IJKL'];
document.write('<pre>' + JSON.stringify(getAllDiagonal(array), 0, 4) + '</pre>');
答案 3 :(得分:2)
试试这个
var TheArray = ['ABCD', 'EFGH', 'IJKL'];
//amount of rows
var RowLength = TheArray.length;
//amount of colums
var ColumnLength = TheArray[0].length;
var totalNoComb = RowLength + ColumnLength - 1;
var combArr = new Array(totalNoComb);
for (var i = 0; i < totalNoComb; i++) {
combArr[i] = "";
for (var j = RowLength-1; j >-1; j--) {
if (i - j > -1 && i - j < ColumnLength)
combArr[i] += TheArray[j][i-j];
}
}
alert(combArr);
for (var i = 0; i < totalNoComb; i++) {
combArr[i] = "";
for (var j = 0; j < RowLength; j++) {
if (i - j > -1 && i - j < ColumnLength)
combArr[i] += TheArray[ RowLength -1-j][i - j];
}
}
alert(combArr);
&#13;
答案 4 :(得分:1)
使用指数:
[i][j-i]
我从0到M-1
j从0到i
虽然j ++&lt; Ñ
表示矩阵
type Array [M] [N]
然而,如果矩阵是矩形的话,这可能会错过右下角的一些,并且您可能需要第二个嵌套for循环,i和j来捕获它们。
答案 5 :(得分:1)
这是我尝试'从左上角到右下角':
for (i=0; i<nbRows; i++) {
x = 0; y = i;
while (x < nbColumns && y >= 0) {
print(array[x, y]);
x++; y--;
}
print("\n");
}
for (i=1; i<nbColumns; i++) {
x = i; y = nbRows - 1;
while (x < nbColumns && y >=0) {
print(array[x, y]);
x++; y--;
}
}
需要进行一些调整以适应JavaScript语法。
答案 6 :(得分:1)
这甚至适用于矩形矩阵:
var array = ["ABCD", "EFGH", "IJKL"];
var arrOfArr = [];
var resultArray = [];
for (var i = 0; i < array.length; ++i) {
arrOfArr.push(array[i].split(''));
}
var rows = arrOfArr.length;
var columns = arrOfArr[0].length;
var index = 0;
for (var i = 0; i < rows; ++i) {
var k = 0;
resultArray[index] = new Array();
for (var j = i; j >= 0; --j) {
resultArray[index].push(arrOfArr[j][k]);
++k;
if ( k === columns) {
break;
}
}
resultArray[index] = resultArray[index].join('');
++index;
}
for (var j = 1; j < columns; ++j) {
var k = rows - 1;
resultArray[index] = new Array();
for (var i = j; i < columns; ++i) {
resultArray[index].push(arrOfArr[k][i]);
--k;
if ( k === -1) {
break;
}
}
resultArray[index] = resultArray[index].join('');
++index;
}
console.log(JSON.stringify(resultArray));
答案 7 :(得分:1)
注意:这假定所有字符串的大小相同,或者至少与第一个字符串一样大。
在2D数组中(或者在这种情况下,是一个字符串数组),对角线的索引加起来对角线的数字(就像一个行号)。 00,01,10,02 11 20等
使用此方法,对角线&#34;行数#34; (从零开始)等于最大索引的总和,或者(columnlength + rowlength-2)的总和。
因此,我的解决方案是遍历对角行数并打印所有索引对,其总和等于当前对角行。
error: reinterpret_cast from type 'const char*' to type 'zidrecord2_t* {aka zidrecord2*}' casts away qualifiers
amostra = reinterpret_cast<zidrecord2_t*>(recordData);
答案 8 :(得分:1)
两种对角线的完整解决方案:
var TheArray = ['ABCD', 'EFGH', 'IJKL'];
var RowLength = TheArray.length;
var ColumnLength = TheArray[0].length;
// Diagonals
var diagonal = [[], []];
for (var i = 0; i < Math.min(RowLength, ColumnLength); i++) {
diagonal[0].push({'row': 0-i, 'col': i});
diagonal[1].push({'row': 0-i, 'col': 0-i});
}
// Entry points
// 1///
// 2///
// 3456
var points = [[], []];
for (var y = 0; y < RowLength; y++) {
points[0].push({'row': y, 'col': 0});
}
for (var x = 1; x < ColumnLength; x++) {
points[0].push({'row': RowLength - 1, 'col': x});
}
// Entry points
// \\\6
// \\\5
// 1234
for (var x = 0; x < ColumnLength; x++) {
points[1].push({'row': RowLength - 1, 'col': x});
}
for (var y = RowLength - 2; y >= 0; y--) {
points[1].push({'row': y, 'col': ColumnLength - 1});
}
var strings = [[], []];
for (var line = 0; line < diagonal.length; line++) {
for (var point = 0; point < points[line].length; point++) {
var inside = true;
var index = 0;
var string = '';
while (inside && index < diagonal[line].length) {
var row = points[line][point]['row'] + diagonal[line][index]['row'];
var col = points[line][point]['col'] + diagonal[line][index]['col'];
if (row >= 0 && row < RowLength && col >= 0 && col < ColumnLength) {
string += TheArray[row][col];
index++;
} else {
inside = false;
}
}
strings[line].push(string);
}
}
console.log(strings);