fix: updated problem output since the numbers of combinations could be very high.

decode-ways/src/ac.cpp

@@ -3,6 +3,8 @@
 typedef long long ll;
 using namespace std;
 
+const int MOD = 1e9 + 7;
+
 ll numDecodings(string s)
 {
    if (s[0] == '0')
@@ -36,15 +38,17 @@ ll numDecodings(string s)
       if (current != '0')
       {
          dp[i][0] = dp[i - 1][0] + dp[i - 1][1];
+         dp[i][0] %= MOD;
       }
 
       int code = stoi(aux);
       if (10 <= code && code <= 26)
       {
          dp[i][1] = dp[i - 2][0] + dp[i - 2][1];
+         dp[i][1] %= MOD;
       }
    }
-   return dp[N][0] + dp[N][1];
+   return (dp[N][0] + dp[N][1]) % MOD;
 }
 
 int main()