[LeetCode]Unique Paths

Find the contiguous subarray within an array (containing at least one number) which has the largest sum.

For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
the contiguous subarray [4,−1,2,1] has the largest sum = 6.

click to show more practice.

More practice:

If you have figured out the O(n) solution, try coding another solution using the divide and conquer approach, which is more subtle.

思考：组合数，dp。

class Solution {

public:

    int uniquePaths(int m, int n) {

        int i,j;

        int dp[100][100];

        memset(dp,0,sizeof(dp));

        for(i=0;i<m;i++)

        {

            for(j=0;j<n;j++)

            {

                if(i==0&&j==0) dp[i][j]=1;

                else if(i==0) dp[i][j]=dp[i][0];

                else if(j==0) dp[i][j]=dp[0][j];

                else dp[i][j]=dp[i-1][j]+dp[i][j-1];

            }

        }

        return dp[m-1][n-1];

    }

};