javaprogram/PascalTriangle.java at master · komi14/javaprogram

41 lines (37 loc) · 1.08 KB

package com.sanket.Array;

import java.util.ArrayList;

import java.util.List;

Problem Link - https://leetcode.com/problems/pascals-triangle/

Status - Accepted

public class PascalTriangle {

public static void main(String[] args) {

int num = 3;

generate(num);

}

public static List<List<Integer>> generate(int numRows) {

List<List<Integer>> lists = new ArrayList<>();

if (numRows < 1) { return lists; }

List<Integer> first = new ArrayList<>();

first.add(1);

lists.add(first);

int i = 1;

while (i < numRows) {

List<Integer> integers = new ArrayList<>();

for (int j = 0; j <= i; j++) {

if (j == 0 || j == i) {

integers.add(1);

}

else {

List<Integer> prev = lists.get(i - 1);

int total = prev.get(j - 1) + prev.get(j);

integers.add(total);

}

lists.add(integers);

i++;

}

return lists;

}

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