C++14(g++5.4) 解法, 执行用时: 6ms, 内存消耗: 488K, 提交时间: 2020-01-11 14:05:43

#include <bits/stdc++.h>
using namespace std;
const int N=1e4+5;
char a[N],s[5],t[7][5]={"Mon","Tue","Wed","Thu","Fri","Sat","Sun"};
int main() {
	int n=0,m;
	scanf("%s%s%d",s,a,&m);
	for(int i=0;a[i];i++) {
		n=(n*10+a[i]-'0')%7;
	}
	int ans=1;
	for(int i=0;i<m;i++) {
		ans=ans*n%7;
	}
	int now;
	for(int i=0;i<7;i++) {
		if(strcmp(t[i],s)==0) now=i;
	}
	now=(now+ans)%7;
	printf("%s\n",t[now]);
	return 0;
}

C++(clang++11) 解法, 执行用时: 3ms, 内存消耗: 376K, 提交时间: 2021-03-07 11:35:54

#include<bits/stdc++.h>
using namespace std;
int b,c;
string s,a,s0[]={"Mon","Tue","Wed","Thu","Fri","Sat","Sun"};
map<string,int>m;
int main()
{
	m["Mon"]=0,m["Tue"]=1,m["Wed"]=2,m["Thu"]=3,m["Fri"]=4,m["Sat"]=5,m["Sun"]=6;
	cin>>s>>a>>b;
	for(int i=0;i<a.size();++i)
	c*=10,c+=a[i]-'0',c%=7;
	cout<<s0[(m[s]+(c%7+6)/7)%7];
	return 0; 
}

Python3(3.5.2) 解法, 执行用时: 32ms, 内存消耗: 3400K, 提交时间: 2020-01-14 13:25:34

res=['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat']
s,n,m=input().split()
s=res.index(s)
if pow(int(n),int(m)//6,7)==0:
    print(res[s])
else:
    print(res[(s+1)%7])

pypy3(pypy3.6.1) 解法, 执行用时: 59ms, 内存消耗: 18652K, 提交时间: 2020-01-11 15:56:42

arr=input().split()
d=["Mon","Tue","Wed","Thu","Fri","Sat","Sun"]
n=int(arr[1])
m=int(arr[2])
r=((n%7)**m)%7
ini=d.index(arr[0])
#print(ini)
print(d[(ini+r)%7])