(暴力枚举) 无优化

C++ 代码

#include <iostream>
#include <string>
using namespace std;

int main() {
    string a[12]= {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
    string x;
    int m=0,y,d,sum=0;
    while(cin>>d>>x>>y) {
        sum=0;
        for(int i=0; i<12; i++) {
            if(a[i]==x) {
                m=i+1;
                break;
            }
        }
        for(int i=1; i<=y-1; i++) {
            if((i%400==0) || ((i%4==0) && (i%100!=0))) {
                sum=sum+366;
            } else {
                sum=sum+365;
            }
        }
        for(int i=1; i<=m-1; i++) {
            if(i==1 || i==3 || i==5 || i==7 || i==8 || i==10) {
                sum=sum+31;
            } else if(i==2) {
                if((y%4==0 && y%100!=0) || (y%400==0)) {
                    sum=sum+29;
                } else {
                    sum=sum+28;
                }
            } else {
                sum=sum+30;
            }
        }
        sum=sum+d;
        switch(sum%7) {
            case 1:
                cout<<"Monday\n";
                break;
            case 2:
                cout<<"Tuesday\n";
                break;
            case 3:
                cout<<"Wednesday\n";
                break;
            case 4:
                cout<<"Thursday\n";
                break;
            case 5:
                cout<<"Friday\n";
                break;
            case 6:
                cout<<"Saturday\n";
                break;
            case 0:
                cout<<"Sunday\n";
                break;
        }
    }
    return 0;

}