题意:给出N个由小写字母组成的队名,用一台古老的打印机这些队名打印出来,问最少要敲几次键盘(队名之间不用按输入顺序),这台打印机只能执行以下3种操作:
1.在现有基础上的末尾继续输入小写字母;
2.删除最后一个字母;
3.打印现有串。
(1 <= N <= 10000, 队名长度 <= 50)
——>>组织好Trip,记录总结点数sz,每个结点到根结点的距离,得到距离根结点最远的结点的距离Max,那么答案为2 * sz + N - Max。
#include <cstdio>
#include <cstring>
#include <algorithm>using namespace std;const int maxw = 50 + 10;
int N;
char name[maxw];struct node{int dis;node *next[26];node(){dis = 0;memset(next, 0, sizeof(next));}
};struct Trip{node *root;int Max;int sz;Trip(){root = new node;Max = -1;sz = 0;}int idx(char c){return c - 'a';}void insert(char *s){node *t = root;int len = strlen(s), i;for(i = 0; i < len; i++){int c = idx(s[i]);if(!t->next[c]){t->next[c] = new node;sz++;}t->next[c]->dis = t->dis + 1;t = t->next[c];}Max = max(Max, t->dis);}void solve(){printf("%d\n", 2 * sz + N - Max);}
};int main()
{while(scanf("%d", &N) == 1){Trip trip;for(int i = 0; i < N; i++){scanf("%s", name);trip.insert(name);}trip.solve();}return 0;
}