leetcode/src/pascalTriangle/pascalTriangle.cpp at master · cobain/leetcode · GitHub

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// Source : https://oj.leetcode.com/problems/pascals-triangle/

// Author : Hao Chen

// Date : 2014-06-18

/**********************************************************************************

* Given numRows, generate the first numRows of Pascal's triangle.

* For example, given numRows = 5,

* Return

* [

* [1],

* [1,1],

* [1,2,1],

* [1,3,3,1],

* [1,4,6,4,1]

* ]

**********************************************************************************/

#include <stdlib.h>

#include <vector>

#include <iostream>

using namespace std;

vector<vector<int> > generate(int numRows)

{

vector<vector<int> > pascalTriangle;

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

vector<int> v;

if (i==0){

v.push_back(1);

} else {

v.push_back(1);

for(int j=0; j<pascalTriangle[i-1].size()-1; j++){

v.push_back(pascalTriangle[i-1][j] + pascalTriangle[i-1][j+1]);

}

v.push_back(1);

}

pascalTriangle.push_back(v);

}

return pascalTriangle;

}

void printTriangle(vector< vector<int> > pt)

{

cout << "[" << endl;

for(int i=0; i<pt.size(); i++){

for(int space=(pt.size()-i-1); space>=0; space--){

cout << " ";

}

cout << "[";

for(int j=0; j<pt[i].size(); j++){

cout << pt[i][j];

if(j<pt[i].size()-1){

cout << ",";

}

cout << "]";

if(i<pt.size()-1){

cout << ",";

}

cout << endl;

}

cout << "]" << endl;

}

int main(int argc, char** argv)

{

int n = 3;

if (argc>1) {

n = atoi(argv[1]);

}

printTriangle(generate(n));

}

leetcode/src/pascalTriangle/pascalTriangle.cpp at master · cobain/leetcode · GitHub

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