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http://poj.org/problem?id=1182
搞了一天这个题了,懵懂状态中,大概理解了,也能自己敲一遍代码。But,只能在这分享几个大牛写的了。。(毕竟自己水平有限,有待提高啊 %>_<%)
http://blog.csdn.net/c0de4fun/article/details/7318642/
http://www.cnblogs.com/zhengguiping--9876/p/4677668.html
http://www.cnblogs.com/liuxin13/p/4668205.html
#include <iostream> #include <cstdio> #include <cstring> #include <cmath> #include <algorithm> #include <queue> using namespace std; #define maxn 52000 int father[maxn], r[maxn]; int Find(int x) { if(x!=father[x]) { int k = father[x]; father[x] = Find(father[x]); r[x] = (r[x]+r[k])%3; } return father[x]; } int main() { int n, m, op, x, y, ans=0; scanf("%d %d", &n, &m); for(int i=0; i<=n; i++) father[i] = i; memset(r, 0, sizeof(r)); while(m --) { scanf("%d %d %d", &op, &x, &y); if(x>n || y>n ||(x==y && op==2)) { ans ++; continue; } int rx = Find(x); int ry = Find(y); op --; if((op+r[y])%3 != r[x] && rx==ry) ans ++; else if(rx!=ry) { father[rx]=ry; r[rx] =(op-r[x]+r[y]+3)%3;///+3是为了防止有负数出现 } } printf("%d\n", ans); return 0; }
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原文地址:http://www.cnblogs.com/daydayupacm/p/5719065.html