奇安信笔试2021-8-7
算法:1 给定数组,返回可能存在的数量
i<j<k, a[i]<a[j]<a[k] 或者 a[i]>a[j]>a[k]
public static int TeamNums (int[] height) { // write code here int count = 0; for (int i = 0; i < height.length; i++) { for (int j = i+1; j>i&&j < height.length; j++) { for (int k = j+1; k>j&&k < height.length; k++) { int a = height[i]; int b = height[j]; int c = height[k]; if (a<b&&b<c)count++; if (a>b&&b>c)count++; } } } return count; }算法第二题: 二维数组找到最大路径值
public class 奇安信 { public static void main(String[] args) { System.out.println(getMaximumResource(new int[][]{{1, 0, 7}, {2, 0, 6}, {3, 4, 5}, {0, 3, 0}, {9, 0, 20}})); } public static int getMaximumResource (int[][] grid) { // write code here int max = 0; Stack<Start> starts = new Stack<>(); for (int i = 0; i < grid.length; i++) { // 遍历所有的可能起始点 for (int j = 0; j < grid[0].length; j++) { if (grid[i][j]!=0){ starts.push(new Start(i,j)); } } } while (!starts.isEmpty()){ int[][] arr = ArrayCopy(grid); Start start = starts.pop(); max = Math.max(max,find(arr,start.i,start.j)); } return max; } private static int find(int[][] temp, int i, int j) { int sum = temp[i][j]; int top =0,left=0,right=0,bottom=0; temp[i][j] = 0; if (i-1>=0&&i-1<temp.length&&temp[i-1][j]!=0){ int[][] arr = ArrayCopy(temp); top = find(arr,i-1,j); } if (i+1>=0&&i+1<temp.length&&temp[i+1][j]!=0){ int[][] arr = ArrayCopy(temp); bottom = find(arr,i+1,j); } if (j-1>=0&&j-1<temp[0].length&&temp[i][j-1]!=0){ int[][] arr = ArrayCopy(temp); left = find(arr,i,j-1); } if (j+1>=0&&j+1<temp[0].length&&temp[i][j+1]!=0){ int[][] arr = ArrayCopy(temp); right = find(arr,i,j+1); } return sum+Math.max(Math.max(top,bottom),Math.max(left,right)); } private static int[][] ArrayCopy(int[][]temp){ // 数组拷贝 int[][] arr = new int[temp.length][temp[0].length]; for (int n = 0; n < temp.length; n++) { for (int m= 0; m < temp[0].length; m++) { arr[n][m] =temp[n][m]; } } return arr; } } class Start{ int i; int j; public Start(int i, int j) { this.i = i; this.j = j; } }