Code:
#include <bits/stdc++.h> #define setIO(s) freopen(s".in","r",stdin) #define maxn 1000000 #define lson ch[u][0] #define rson ch[u][1] using namespace std; int ch[maxn][2], f[maxn], g[maxn]; int n = 1; void read(int u) { char c = getchar(); if(c == '0') return; ++n, lson = n, read(lson); if(c == '2') ++n, rson = n, read(rson); } void dfs1(int u) { if(!u) return; dfs1(lson), dfs1(rson); f[u] = g[lson] + g[rson] + 1; g[u] = max(f[lson] + g[rson], g[lson] + f[rson]); } void dfs2(int u) { if(!u) return; dfs2(lson), dfs2(rson); f[u] = g[u] = 0; f[u] = g[lson] + g[rson] + 1; g[u] = min(f[lson] + g[rson], g[lson] + f[rson]); } int main() { // setIO("input"); read(1); dfs1(1); printf("%d ",max(g[1], f[1])); dfs2(1); printf("%d\n",min(g[1], f[1])); return 0; }