NOIP 字串变换

思路

因为有很多的相似部分不妨用define定义一下, 会很好.

Code

#include <bits/stdc++.h>
using namespace std; 
#define MAXN 32005
#define F(i, a, b) for(int i=a; i<=b;i++)
#define Fd(i, a, b) for(int i=a;i>=b;i--)

#define out(x) buf[cnt++] = (x)

#define LOP F(k, 1, p2){\
				if(p1 == 1){\
					if(j>='A' && j<='Z'){\
						cout<<tolower((char)j);\
					}else{\
						out(char(j));\
					}\
				}else if(p1 == 2){\
					if(j>='a' && j<='z'){\
						out(toupper((char)j));\
					}else{\
						out(char(j));\
					}\
				}else if(p1 == 3){\
					out('*');\
				}\
			}
char buf[MAXN] = {};
int cnt= 0;
int main(){
	int p1, p2, p3; cin>>p1>>p2>>p3;
	string s; cin>>s;
	
	s = "$"+s;
	
	int len = s.length();
	F(i, 1, len){
		if(s[i] == '-'){
			if(i != len){
				if(s[i-1] < s[i+1] 
				&&
				(
				 (isdigit(s[i-1]) && isdigit(s[i+1]))|| 
				 (isalpha(s[i-1]) && isalpha(s[i+1]))
				)
				){
					
					if(p3 == 2){
						Fd(j, s[i+1]-1, s[i-1]+1){
							LOP
						}
					}else if(p3 == 1){
						F(j, s[i-1]+1, s[i+1]-1){
							LOP
						}
					}
				}else{
					out(s[i]);
				}
			}else{
				out(s[i]);
			}
		}else{
			out(s[i]);
		}
	}
	cout<<buf<<endl;
}