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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 &note = 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;}