http://codeforces.com/contest/1191
A
给一个数，可以加0,1或2然后取模，再映射到字母，字母有排名，求最大排名。
总共只有4种情况，讨论即可
#include<iostream> #include<cstdio> #include<string> #include<cstring> #include<algorithm> #include<cmath> #include<vector> #define ll long long #define fo(i,l,r) for(int i = l;i <= r;i++) #define fd(i,l,r) for(int i = r;i >= l;i--) #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|1 using namespace std; const int maxn = 400050; const ll inf = 987654321234500LL; const ll mod = 1e9+7; ll n; ll read() { ll x=0,f=1; char ch=getchar(); while(!(ch>='0'&&ch<='9')) { if(ch=='-')f=-1; ch=getchar(); }; while(ch>='0'&&ch<='9') { x=x*10+(ch-'0'); ch=getchar(); }; return x*f; } int tran[4]={1,4,3,2}; int main() { n=read(); int mx,dd; n %= 4; if(n==0){ dd=1; mx = 0; } if(n==1){ dd = 0; mx = 0; } if(n==2){ dd = 1; mx = 1; } if(n==3){ dd = 2; mx = 0; } cout<<dd<<" "<<(char)('A'+mx); return 0; }