题解 | 手机键盘

#include<stdio.h>
#include<map>
using namespace std;
int main()
{
	map<char,int> in={
	{'a',1},{'b',2},{'c',3},
	{'d',1},{'e',2},{'f',3},
	{'g',1},{'h',2},{'i',3},
	{'j',1},{'k',2},{'l',3},
	{'m',1},{'n',2},{'o',3},
	{'p',1},{'q',2},{'r',3},{'s',4},
	{'t',1},{'u',2},{'v',3},
	{'w',1},{'x',2},{'y',3},{'z',4}
	};
	map<char,int> key={
	{'a',2},{'b',2},{'c',2},
	{'d',3},{'e',3},{'f',3},
	{'g',4},{'h',4},{'i',4},
	{'j',5},{'k',5},{'l',5},
	{'m',6},{'n',6},{'o',6},
	{'p',7},{'q',7},{'r',7},{'s',7},
	{'t',8},{'u',8},{'v',8},
	{'w',9},{'x',9},{'y',9},{'z',9}
	};
	char str[200];
	while(scanf("%s",str)!=EOF){
		int last=0;
		int sum=0;
		for(int i=0;str[i]!='\0';i++){
			if(key[str[i]]==last){
				sum=sum+2;
			}
			sum=sum+in[str[i]];
			last=key[str[i]];
		}
        printf("%d\n",sum);
	}
	return 0;
}