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题目链接 http://noi-test.zzstep.com/contest/0x29%E3%80%8C%E6%90%9C%E7%B4%A2%E3%80%8D%E7%BB%83%E4%B9%A0/2907%20%E4%B9%B3%E8%8D%89%E7%9A%84%E5%85%A5%E4%BE%B5 分析 BFS裸题，每次向周边八个位置扩展即可。 AC代码 # include <cstdio> # include <cstring> # include <algorithm> # include <queue> using namespace std ; inline int read ( ) { int num = 0 ; char c = getchar ( ) ; while ( c < '0' || c > '9' ) c = getchar ( ) ; while ( c >= '0' && c <= '9' ) num = num * 10 + c - '0' , c = getchar ( ) ; return num ; } const int maxn = 105 ; const int nxt [ 8 ] [ 2 ] = { { - 1 , 0 } , { 1 , 0 } , { 0 , - 1 } , { 0 , 1 } , { - 1 , - 1 } ,

一：实现流量监控 （一）流量监控原理 其中控制器向交换机周期下发获取统计消息，请求交换机消息------是主动下发过程 流速公式：是（t1时刻的流量-t0时刻的流量）/（t1-t0) 剩余带宽公式：链路总带宽-流速--------是这一个这一个,例如s2-s3（不是一条，例如：h1->s1->s2->s3->h2）的剩余带宽 路径有效带宽是只：这一整条路径中，按照最小的剩余带宽处理 二：代码实现 （一）代码框架 from ryu.app import simple_switch_13 from ryu.controller.handler import set_ev_cls from ryu.controller import ofp_event from ryu.controller.handler import MAIN_DISPATCHER,DEAD_DISPATCHER class MyMonitor(simple_switch_13): #simple_switch_13 is same as the last experiment which named self_learn_switch ''' design a class to achvie managing the quantity of flow ''' def __init__(self,*args,*

题目链接 http://noi-test.zzstep.com/contest/0x29%E3%80%8C%E6%90%9C%E7%B4%A2%E3%80%8D%E7%BB%83%E4%B9%A0/2907%20%E4%B9%B3%E8%8D%89%E7%9A%84%E5%85%A5%E4%BE%B5 分析 BFS裸题，每次向周边八个位置扩展即可。 AC代码 # include <cstdio> # include <cstring> # include <algorithm> # include <queue> using namespace std ; inline int read ( ) { int num = 0 ; char c = getchar ( ) ; while ( c < '0' || c > '9' ) c = getchar ( ) ; while ( c >= '0' && c <= '9' ) num = num * 10 + c - '0' , c = getchar ( ) ; return num ; } const int maxn = 105 ; const int nxt [ 8 ] [ 2 ] = { { - 1 , 0 } , { 1 , 0 } , { 0 , - 1 } , { 0 , 1 } , { - 1 , - 1 } ,