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#include <iostream> #include <cstring> using namespace std; string n; int dp[15][5]; int rec(int i, int br){ if((i==n.size())and(br==4)){ return 1; } if(i==n.size()){ return 0; } int result=0; if(dp[i][br]!=-1){ return(dp[i][br]); } int k=0; if(n[i] == '0'){ result+=rec(i+1, br+1); } else{ for(int j=i; j<n.size(); j++){ k=k*10+(n[j]-'0'); if(k<=255){ result+=rec(j+1, br+1); } } } dp[i][br]=result; return(result); } int main() { cin>>n; memset(dp, -1, sizeof dp); cout<<rec(0, 0); return 0; }
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