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HDU 3652 B-number 数位DP
很裸,注意状态的记录和存储
#include <cstdio>#include <cstring>#include <cmath>#include <algorithm>#include <climits>#include <string>#include <iostream>#include <map>#include <cstdlib>#include <list>#include <set>#include <queue>#include <stack>using namespace std;typedef long long LL;const int maxn = 20;int lim[maxn],len;int f[15][15][2][13];void getlim(int num) { len = 0; memset(lim,0,sizeof(lim)); while(num) { lim[len++] = num % 10; num /= 10; }}int dfs(int now,int prev,int exist,int rest,int bound) { int ¬e = f[now][prev][exist][rest]; if(now == 0) { return rest % 13 == 0 && exist; } int ret = 0,m = bound ? lim[now - 1] : 9; if(!bound && note != -1) return note; for(int i = 0;i <= m;i++) { int ne = 0; if(i == 3 && prev == 1) ne = 1; ret += dfs(now - 1,i,ne | exist,(rest * 10 + i) % 13,bound && i == m); } if(!bound) note = ret; return ret;}int work(int num) { getlim(num); return dfs(len,0,0,0,1);}int main() { int n; while(scanf("%d",&n) != EOF) { memset(f,-1,sizeof(f)); printf("%d\n",work(n)); } return 0;}
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