有N个变量X1X1~XNXN,每个变量的可能取值为0或1. 给定M个算式,每个算式形如 XaopXb=cXaopXb=c,其中 a,b 是变量编号,c 是数字0或1,op 是 and,or,xor 三个位运算之一. 求是否存在对每个变量的合法赋值,使所有算式都成立. 输入格式 第一行包含两个整数N和M. 接下来M行,每行包含三个整数a b c,以及一个位运算(AND,OR,XOR中的一个). 输出格式 输出结果,如果存在,输出“YES”,否则输出“NO” 数据范围 1≤N≤10001≤N≤100…

题意: 有n个未知量,m对未知量之间的关系,判断是否能求出所有的未知量且满足这些关系 解析: 关系建边就好了 #include <iostream> #include <cstdio> #include <sstream> #include <cstring> #include <map> #include <cctype> #include <set> #include <vector> #include &…

题意: 就是一个圈上有n个点,给出m对个点,这m对个点,每一对都有一条边,合理安排这些边在圈内或圈外,能否不相交 解析: 我手残 我手残 我手残 写一下情况 只能是一个在圈外 一个在圈内 即一个1一个0 #include <iostream> #include <cstdio> #include <sstream> #include <cstring> #include <map> #include <cctype> #include…

Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integer c (0 ≤ c ≤ 1). One Katu is solvable if one can find each vertex Vi a value Xi (0 ≤ Xi ≤ 1) s…

Katu Puzzle Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9987   Accepted: 3741 Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integ…

Description Katu Puzzle ≤ c ≤ ). One Katu ≤ Xi ≤ ) such that for each edge e(a, b) labeled by op and c, the following formula holds: Xa op Xb = c The calculating rules are: AND 0 1 0 0 0 1 0 1 OR 0 1 0 0 1 1 1 1 XOR 0 1 0 0 1 1 1 0 Given a Katu Puzzl…

Katu Puzzle Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6553   Accepted: 2401 Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integ…

                                                                     Katu Puzzle Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11429   Accepted: 4233 Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, …

Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integer c (0 ≤ c ≤ 1). One Katu is solvable if one can find each vertex Vi a value Xi (0 ≤ Xi ≤ 1) s…

Katu Puzzle Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 6714   Accepted: 2472 Description Katu Puzzle is presented as a directed graph G(V, E) with each edge e(a, b) labeled by a boolean operator op (one of AND, OR, XOR) and an integ…