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矩形覆盖 java
题目描述
- 我们可以用2 * 1的小矩形横着或者竖着去覆盖更大的矩形。请问用n个2 * 1的小矩形无重叠地覆盖一个2 * n的大矩形,总共有多少种方法?
代码1:
public class Solution {
public int RectCover(int target) {
int n = 0;
if(target == 1){
n = 1;
}
if(target == 2){
n = 2;
}
if(target > 2){
n = RectCover(target - 1) + RectCover(target - 2);
}
return n;
}
}
代码2:推荐使用
public class Solution {
public int RectCover(int target) {
int n = 0;
int a = 1, b = 2;
if(target == 1){
n = a;
}
if(target == 2){
n = b;
}
if(target > 2){
for(int i = 3; i <= target; i++){
n = a + b;
a = b;
b = n;
}
}
return n;
}
}