题意:给定一个数字串,最长是6,然后有两种操作。
第一种是,把该串中的一个数字换成一个比该数字小的数,比如 5 可以换成 0,1,2,3,4. e.g. 12345 --> 12341
第二种是,把数字 0 以及它后面的数都删掉,e.g. 120154 --> 12
析:因为数字最长是 6 位,所以直接把所有的情况都算出来,就好了,这首先 g[1] = 0,然后能够该必败态的,都是必胜态,然后没有到达的点都是必败点,就这样就可以筛选了,还要注意的事从必败态去筛选必胜态的时候,有两种情况,
第一种是把其实的数字进行加法,最高到9。比如 1 筛选的时候, 1 2 3 4 5 6 7 8 9 都要筛选掉,因为这些都能得到 1
第二种不够六位的添加一个0,然后后面, 随便 比如 1 101 102 1012 10123 101234 这样的
代码如下:
#pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstdlib> #include <cmath> #include <iostream> #include <cstring> #include <set> #include <queue> #include <algorithm> #include <vector> #include <map> #include <cctype> #include <cmath> #include <stack> #include <sstream> #include <list> #include <assert.h> #include <bitset> #include <numeric> #define debug() puts("++++") #define gcd(a, b) __gcd(a, b) #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|1 #define fi first #define se second #define pb push_back #define sqr(x) ((x)*(x)) #define ms(a,b) memset(a, b, sizeof a) #define sz size() #define pu push_up #define pd push_down #define cl clear() #define lowbit(x) -x&x //#define all 1,n,1 #define FOR(i,x,n) for(int i = (x); i < (n); ++i) #define freopenr freopen("in.in", "r", stdin) #define freopenw freopen("out.out", "w", stdout) using namespace std; typedef long long LL; typedef unsigned long long ULL; typedef pair<int, int> P; const int INF = 0x3f3f3f3f; const LL LNF = 1e17; const double inf = 1e20; const double PI = acos(-1.0); const double eps = 1e-8; const int maxn = 1e6 + 10; const int maxm = 100 + 2; const LL mod = 100000000; const int dr[] = {-1, 1, 0, 0, 1, 1, -1, -1}; const int dc[] = {0, 0, 1, -1, 1, -1, 1, -1}; const char *de[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"}; int n, m; const int mon[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; const int monn[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; inline bool is_in(int r, int c) { return r >= 0 && r < n && c >= 0 && c < m; } int g[maxn]; char s[10]; int a[10]; void solve(int n){ int len = 0, x = n; while(x){ a[++len] = x % 10; x /= 10; } for(int i = 1; i <= len; ++i){ int m = 1; x = i; while(--x) m *= 10; for(int j = 1; j + a[i] < 10; ++j) g[n+j*m] = 1; } x = 6 - len; int y = 1; while(x--){ n *= 10; for(int i = 0; i < y; ++i) g[n+i] = 1; y *= 10; } } int main(){ for(int i = 1; i < 1000000; ++i) if(!g[i]) solve(i); while(scanf("%s", s) == 1){ if(s[0] == '0'){ puts("Yes"); continue; } n = atoi(s); if(g[n]) puts("Yes"); else puts("No"); } return 0; }