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-rw-r--r--pascals_triangle.cpp19
1 files changed, 19 insertions, 0 deletions
diff --git a/pascals_triangle.cpp b/pascals_triangle.cpp
new file mode 100644
index 0000000..343c116
--- /dev/null
+++ b/pascals_triangle.cpp
@@ -0,0 +1,19 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ vector<vector<int>> generate(int numRows) {
+ vector<vector<int>> ans(numRows);
+ for (int i = 0; i < numRows; i++) {
+ vector<int> row(i + 1, 1);
+ int mid = i >> 1;
+ for (int j = 1; j <= mid; j++) {
+ int val = ans[i - 1][j - 1] + ans[i - 1][j];
+ row[j] = val;
+ row[row.size() - j - 1] = val;
+ }
+ ans[i] = row;
+ }
+ return ans;
+ }
+};