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-rw-r--r--decode_ways.cpp23
1 files changed, 23 insertions, 0 deletions
diff --git a/decode_ways.cpp b/decode_ways.cpp
new file mode 100644
index 0000000..c03bd67
--- /dev/null
+++ b/decode_ways.cpp
@@ -0,0 +1,23 @@
+#include "leetcode.h"
+
+class Solution {
+public:
+ int numDecodings(string s) {
+ int n = s.size();
+ vector<int> dp(n + 1, 0);
+ dp[0] = 1;
+ for (int i = 0; i < n; ++i) {
+ if (s[i] != '0')
+ dp[i + 1] += dp[i];
+ if (i >= 1 &&
+ (s[i - 1] == '1' || (s[i - 1] == '2' && s[i] >= '0' && s[i] <= '6')))
+ dp[i + 1] += dp[i - 1];
+ }
+ return dp[n];
+ }
+};
+
+int main() {
+ Solution obj;
+ cout << obj.numDecodings("226");
+}