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It's Saturday today, what day is it after 11 + 22 + 33 + ... + NN days?
There are multiple test cases. The first line of input contains an integer Tindicating the number of test cases. For each test case:
There is only one line containing one integer N (1 <= N <= 1000000000).
For each test case, output one string indicating the day of week.
212
SundayThursday
A week consists of Sunday, Monday, Tuesday, Wednesday, Thursday, Friday and Saturday.
题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3785
这个题以前做过,问你1^1+2^2......+n^n天后星期几,这个题我不知道正解,打了个表,发现循环节是294,就水过了,过了。。。。。。
代码:
#include <iostream>#include <cstdio>#include <cstring>using namespace std;int a[1000];char str[11][11]={"Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday"};void Init(){ for(int i=1;i<=294;i++){ int k=1; for(int j=1;j<=i;j++){ k*=i; k%=7; } a[i]=(a[i-1]+k)%7; }}int main(){ int t; Init(); scanf("%d",&t); while(t--){ int n; scanf("%d",&n); n=(n-1)%294+1; int x=a[n]%7; printf("%s\n", str[x]); } return 0;}
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