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题意:给定一个手机键盘数字九宫格,然后让你判断某种操作是不是唯一的,也就是说是不是可以通过平移也能实现。
析:我的想法是那就平移一下,看看能实现,就四种平移,上,下,左,右,上是-3,要注意0变成8,如果有数字变成小于等于0了,那么就是不可以,同理,下是+3,8可以变成0,其他的也是这样,
注意左右平移是147,和369,是不能平移,然后就AC了。再简化一下就是如果有123,就不能上移,如果有79就不能下移,如果有147就不能左移,如果有369就不能右移,如果有0就不能下左右移。
代码如下:
#include <iostream> #include <cstdio> using namespace std; const int maxn = 9 + 5; int a[maxn]; int b[maxn]; char s[maxn]; int main(){ int n; while(scanf("%d", &n) == 1 && n){ scanf("%s", s); for(int i = 0; i < n; ++i) a[i] = s[i] - ‘0‘; bool ok = false; for(int i = 0; i < n; ++i)//下 if(a[i] && a[i] != 8) b[i] = a[i] + 3; else if(a[i] == 8) b[i] = 0; else b[i] = 10; int i; for(i = 0; i < n; ++i) if(b[i] > 9) break; if(i == n) ok = true; for(i = 0; i < n; ++i)//上 if(a[i]) b[i] = a[i] - 3; else b[i] = 8; for(i = 0; i < n; ++i) if(b[i] <= 0) break; if(i == n) ok = true; for(i = 0; i < n; ++i)//右 if(3 == a[i] || 6 == a[i] || 9 == a[i]) b[i] = 10; else if(a[i]) b[i] = a[i] + 1; else b[i] = 10; for(i = 0; i < n; ++i) if(b[i] > 9) break; if(i == n) ok = true; for(i = 0; i < n; ++i)//左 if(a[i] == 1 || a[i] == 4 || a[i] == 7) b[i] = -10; else if(a[i]) b[i] = a[i] - 1; else b[i] = -10; for(i = 0; i < n; ++i) if(b[i] <= 0) break; if(i == n) ok = true; if(!ok) puts("YES"); else puts("NO"); } return 0; }
第二种:
#include <iostream> #include <cstdio> using namespace std; const int maxn = 9 + 5; int a[maxn]; int b[maxn]; char s[maxn]; int main(){ int n; while(scanf("%d", &n) == 1 && n){ scanf("%s", s); int l = 0, u = 0, r = 0, d = 0; for(int i = 0; i < n; ++i){ if(s[i] == ‘0‘) l = r = d = 1; if(s[i] == ‘1‘ || s[i] == ‘4‘ || s[i] == ‘7‘) l = 1; if(s[i] == ‘3‘ || s[i] == ‘6‘ || s[i] == ‘9‘) r = 1; if(s[i] == ‘1‘ || s[i] == ‘2‘ || s[i] == ‘3‘) u = 1; if(s[i] == ‘7‘ || s[i] == ‘9‘) d = 1; } if(u && d && l && r) puts("YES"); else puts("NO"); } return 0; }
CoderForces 689A Mike and Cellphone (水题)
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原文地址:http://www.cnblogs.com/dwtfukgv/p/5649580.html