POJ 3437 Tree Grafting

题意：给出一个深度优先遍历树的up down顺序，求这棵树以及这棵树变为”左子右兄”树的高度

思路：直接dfs，x代表树1的高度，y代表树2的高度

#include<cstdio>
#include<cmath>
#include<cstring>
#include<iostream>
#include<algorithm>
int h1=,h2=,u=;
char s[];
int read(){
    char ch=getchar();int f=,t=;
    while (ch<''||ch>'') {if (ch=='-') f=-;ch=getchar();}
    while (''<=ch&&ch<=''){t=t*+ch-'';ch=getchar();}
    return t*f;
}
void dfs(int x,int y){
    int son=;
    while (s[u]=='d'){
        u++;son++;
        dfs(x+,y+son);
    }
    u++;
    h1=std::max(h1,x);
    h2=std::max(h2,y);
}
int main(){
    int T=;
    scanf("%s",s);
    while (s[]!='#'){
        h1=h2=u=;
        dfs(,);
        printf("Tree %d: %d => %d\n",++T,h1,h2);
        scanf("%s",s);
    }
}