ZOJ What day is that day? (觅最小周期)
ZOJ What day is that day? (找最小周期)
It's Saturday today, what day is it after 11 + 22 + 33 + ... + NN days?
Input
There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:
There is only one line containing one integer N (1 <= N <= 1000000000).
Output
For each test case, output one string indicating the day of week.
Sample Input
2 1 2
Sample Output
Sunday Thursday
Hint
A week consists of Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.
#include<stdio.h> #include<math.h> int c[297]; void init() { int a; c[0]=1; for(int i=1;i<=295;i++) { a=(i+1)%7; for(int j=2;j<=i+1;j++) a=(a*(i+1))%7; c[i]=(c[i-1]+a)%7; } } int main() {init(); int n,t; char day[8][20]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"}; scanf("%d",&t); while(t--) { scanf("%d",&n); n%=294; if(n)n--; else n=293; int d=c[n]; if(d)d-=1; else d=6; printf("%s\n",day[d]); } }