输入输出示例

输入：
9 October 2001
14 October 2001
输出：
Tuesday
Sunday

【原题链接】

字符串处理

C风格的字符串

• 字符数组，以’\0‘结尾
• 建议在输入输出语句中使用

C++风格的字符串

#include <string>
using namespace std;

• 初始化：string str1 = str;//world
• 连接： str1 + “hello” //即"worldhello"
• 字符：str1[0]//即’w’
• 长度：str1.length();
• 判断相符：str1 == “world”
• 比较字典顺序：str1 > “abandon”
• 从C++风格到C风格：str1.c_str();

字符串到数字的对应：map映射

#include <map>
using namespace std;

    map<string,string> myMap = {
            //<键key的类型，值value的类型>
            {"Caixukun","ikun"},
            {"Wuyifan","meigeni"}
    };
    char str[100];
    scanf("%s",str);
    string name = str;
    printf("%s的粉丝被称为%s\n",name.c_str(),myMap[name].c_str());

星期的计算

根据今天是星期几，计算要求日期距离今天的距离，然后计算其星期数即可

#include <cstdio>
#include <string>
#include <map>
using namespace std;
int main() {
    map<string,int> month2int = {
            {"January",1},
            {"February",2},
            {"March",3},
            {"April",4},
            {"May",5},
            {"June",6},
            {"July",7},
            {"August",8},
            {"September",9},
            {"October",10},
            {"November",11},
            {"December",12}
    };
    int month_Day[13]={0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    string int2Weekday[7] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
    int year, mon, day;
    char str[100];
    string month;
    bool isBefore;//在过去还是在未来
    while(scanf("%d%s%d",&day,str,&year)!=EOF){
        month = str;//把字符串从C风格转换成C++风格
        mon = month2int[month];
        if (year < 2024||2024 == year && mon <3 || 2024 ==year &&mon==3&&day <10){
            isBefore= true;
        }else{
            isBefore= false;
        }

        //从begin走到end
        int beginYear, beginMon, beginDay, endYear, endMonth, endDay;
        if (isBefore){
            beginYear = year;
            beginMon = mon;
            beginDay = day;
            endYear = 2024;
            endMonth = 3;
            endDay = 10;
        } else{
            beginYear = 2024;
            beginMon = 3;
            beginDay = 10;
            endYear = year;
            endMonth = mon;
            endDay = day;
        }
        //2024年3月10日是星期日
        int totalDay = 0;
        while(true){
            if (beginYear==endYear&&beginMon==endMonth&&beginDay==endDay){
                break;
            }
            ++totalDay;
            //next day
            bool isLeap = beginYear%400==0||beginYear%100!=0&&beginYear%4==0;
            if(isLeap){
                month_Day[2]=29;
            } else{
                month_Day[2]=28;
            }
            ++beginDay;
            if (beginDay>month_Day[beginMon]){
                beginDay = 1;
                ++beginMon;
                if (beginMon>12){
                    beginMon=1;
                    beginYear++;
                }
            }
        }
        if (isBefore){

            printf("%s\n",int2Weekday[7-totalDay%7].c_str());
        }else{
            printf("%s\n",int2Weekday[(totalDay)%7].c_str());
        }

    }
    return 0;
}