Add problem 63 .

1 files changed, 44 insertions, 0 deletions

diff --git a/cpp/63.cpp b/cpp/63.cpp
new file mode 100644
index 0000000..8e01c44
--- /dev/null
+++ b/cpp/63.cpp
@@ -0,0 +1,44 @@
+#include <vector>
+
+using std::vector;
+
+class Solution
+{
+public:
+    int uniquePathsWithObstacles(vector<vector<int>> &obstacleGrid)
+    {
+        if (obstacleGrid[0][0])
+            return 0;
+        obstacleGrid[0][0] = 1;
+
+        int row = obstacleGrid.size();
+        int col = obstacleGrid.front().size();
+
+        for (int i = 1; i < row; i++)
+        {
+            obstacleGrid[i][0] = obstacleGrid[i - 1][0] && !obstacleGrid[i][0] ? 1 : 0;
+        }
+
+        for (int i = 1; i < col; i++)
+        {
+            obstacleGrid[0][i] = obstacleGrid[0][i - 1] && !obstacleGrid[0][i] ? 1 : 0;
+        }
+
+        for (int r = 1; r < row; r++)
+        {
+            for (int c = 1; c < col; c++)
+            {
+                if (obstacleGrid[r][c])
+                {
+                    obstacleGrid[r][c] = 0;
+                }
+                else
+                {
+                    obstacleGrid[r][c] = obstacleGrid[r - 1][c] + obstacleGrid[r][c - 1];
+                }
+            }
+        }
+
+        return obstacleGrid[row - 1][col - 1];
+    }
+};