题解 | 手机键盘

#include <iostream>
using namespace std;

int main() {
    string s;
	cin>>s;
	int sum = 0;
	int f[26] = {1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
	sum+=f[s[0]-'a'];
	for(int i=1;i<s.size();i++)
	{
		sum+=f[s[i]-'a'];
		if((s[i]-'a')-(s[i-1]-'a')==f[s[i]-'a']-f[s[i-1]-'a'])
		{
			sum+=2;
		}
	}
	
	cout<<sum;
}
// 64 位输出请用 printf("%lld")