Pascal's Triangle 打印数字三角形
2015-03-30 20:08
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Pascal's Triangle
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]
]class Solution {
public:
vector<vector<int> > generate(int numRows) {
vector<vector<int>> ans ;
int i,j;
for(i=0;i<numRows;i++)
{
vector<int> cur;
for(j=0;j<=i;j++)
{
if(j==0||j==i)
cur.push_back(1);
else
cur.push_back(ans[i-1][j-1]+ans[i-1][j]);
}
ans.push_back(cur);
}
return ans;
}
};
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