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#include <iostream> using namespace std; string s; int memo[255]; int f(int x) { if(x >= s.length()) { return 1; } if(memo[x] != -1) { return memo[x]; } int ways = 0; if(s[x] != '0') { ways += f(x + 1); } if(s[x] != '0' and x + 1 < s.length()) { int number = (s[x] - '0') * 10 + (s[x + 1] - '0'); if(number <= 26) { ways += f(x + 2); } } memo[x] = ways; return memo[x]; } int main() { cin >> s; for(int i = 0; i <= s.length(); i++) { memo[i] = -1; } cout << f(0) << endl; return 0; } // 2504
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