交错和(数位dp)

交错和   数位DPhtml   1 #include <bits/stdc++.h> 2 using namespace std; 3 #define LL long long 4 const int mod = 1e9 + 7; 5 6 struct Node{ 7 LL sum, cnt; 8 }dp[21][10][2][410]; 9 int bit[21];

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