classSolution{public:vector<int>getRow(introwIndex){ vector<int> ans;for(inti =0; i < rowIndex +1; i++) { ans.push_back(1);for(intj = i -1; j >0; j--) ans[j] += ans[j -1]; }returnans; } };
对于第2个pascal triangle,通过观察可以发现,其实只需要2个额外的变量来记录,于是就设了个tmp数组。 整体有点DP问题中的滚动数组的感觉。 1#include <vector>2#include <iostream>3usingnamespacestd;45classSolution {6public:7vector<vector<int> > generate(intnumRows) {8vector<vector<int>>res;9if(numRow...
实现代码: ## LeetCode 118classSolution:defgenerate(self,num_rows):## The number of rowstriangle=[]forrow_numinrange(num_rows):## For a specific rowrow=[Nonefor_inrange(row_num+1)]## All None for this rowrow[0]=1## The most left number = 1row[-1]=1## The most right number...
Learn how to generate and print the pascal triangle in the C programming language. In mathematics, Pascal's triangle is a triangular arrangement of numbers that gives the coefficients in the expansion of any binomial expression, such as(x + y)n. It is named for the 17th-century French mathe...
Leetcode: Pascal's Triangle 题目: GivennumRows, generate the firstnumRowsof Pascal's triangle. For example, givennumRows= 5, Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] 1. 2. 3. 4. 5. 6. 7.
for x in range(i - 1): row[x+1] = ans[i-1][x] + ans[i-1][x+1] print row ans.append(row) return ans 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Pascal’s Triangle II
sort() # dp[i] 表示第 i 个孩子分到的糖果数,初始化最少每人一个 dp: List[int] = [1] * n # ans 维护所有孩子分到的糖果数之和 ans: int = 0 #按 rating 升序进行状态转移,这样就能保证在更新 dp[i] 时, # 其左右两侧的 dp 值均已确定 for (rating, i) in cells: # 如果其评分...
118. 杨辉三角 - 给定一个非负整数 numRows,生成「杨辉三角」的前 numRows 行。 在「杨辉三角」中,每个数是它左上方和右上方的数的和。 [https://pic.leetcode-cn.com/1626927345-DZmfxB-PascalTriangleAnimated2.gif] 示例 1: 输入: numRows = 5 输出: [[1],[1,1
升级版本,注意 Pascal's Triangle, 其实是左右是对称的. 在子函数pascal不用全部都遍历计算,只用处理len/2,其他用对称就可以 vector<int>pascal(vector<int>&nums,intline){vector<int>rows(line+1);intlen=nums.size();rows[0]=1;for(inti=1;i<=len/2;++i){rows[i]=nums[i-1]+nums[i];rows[le...
Leetcode - Pascal's Triangle Paste_Image.png My code: import java.util.ArrayList;import java.util.List;publicclassSolution{publicList<List<Integer>>generate(intnumRows){List<List<Integer>>result=newArrayList<List<Integer>>();if(numRows<=0)returnresult;List<Integer>newList=newArrayList<Integer>(...