标签：des style blog http color io os ar java
That is, does the 13th of the month land on a Friday less often than on any other day of the week? To answer this question, write a program that will compute the frequency that the 13th of each month lands on Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday over a given period of N years. The time period to test will be from January 1, 1900 to December 31, 1900+N-1 for a given number of years, N. N is non-negative and will not exceed 400.
There are few facts you need to know before you can solve this problem:
Do not use any built-in date functions in your computer language.
Don‘t just precompute the answers, either, please.
For each input, there is an output correspond to it, each have the following format:
Seven space separated integers on one line. These integers represent the number of times the 13th falls on Saturday, Sunday, Monday, Tuesday, ..., Friday.
20
36 33 34 33 35 35 34
刷道存在感。。
题意 ：问从1900年往后的n年里，每个月的13号分布在星期1到7的情况。。这算哈希？反正暴力就可以了
#include <cstdio> #include <iostream> #include <algorithm> #include <cstring> #include <cctype> #include <cmath> #include <cstdlib> #include <vector> #include <queue> #include <set> #include <map> #include <list> #define ll long long using namespace std; const int INF=1<<27; const int maxn=1010; int n,num[8]; bool is_leap(int year) { if((year%4==0&&year%100!=0)||year%400==0) return 1; else return 0; } void solve() { memset(num,0,sizeof(num)); int xx=1; for(int year=1900;year<=1900+n-1;year++) { for(int month=1;month<=12;month++) { int tem; if(month==1||month==3||month==5||month==7||month==8||month==10||month==12) tem=31; else if(month==4||month==6||month==9||month==11) tem=30; else if(month==2&&is_leap(year)) tem=29; else if(month==2&&!is_leap(year)) tem=28; int tag=(xx+12)%7==0?7:(xx+12)%7; xx=(xx+tem)%7==0?7:(xx+tem)%7; num[tag]++; } } printf("%d %d",num[6],num[7]); for(int i=1;i<=5;i++) printf(" %d",num[i]); puts(""); } int main() { while(~scanf("%d",&n)) solve(); return 0; }
SDUT 1941-Friday the Thirteenth（水）
标签：des style blog http color io os ar java
原文地址：http://blog.csdn.net/qq_16255321/article/details/40269263
