[POJ3295]Tautology 试题描述 WFF 'N PROOF is a logic game played with dice. Each die has six faces representing some subset of the possible symbols K, A, N, C, E, p, q, r, s, t. A Well-formed formula (WFF) is any string of these symbols obeying the follow…

题目链接: https://vjudge.net/problem/POJ-3295 题目大意: 输入由p.q.r.s.t.K.A.N.C.E共10个字母组成的逻辑表达式WFF      其中      p.q.r.s.t的值为1(true)或0(false),即逻辑变量. K.A.N.C.E为逻辑运算符,含义如下: 问WFF是否为[永真式] (大前提:[输入格式保证是合法的]) 思路: 可以把上述打表,然后求表达式的时候用栈,从后往前来模拟.之后在网上看到各个大写字母转化成具体表达式: K --…

https://vjudge.net/problem/POJ-3295 题意 有五种运算符和五个参数,现在给你一个不超过100字符的算式,问最后结果是否恒为1? 分析 首先明确各运算符的意义,K(&&),A(||),N(!),E(==),C特殊判断一下.计算的话肯定是从后往前的,遇到变量进栈,遇到运算符则出栈做运算.现在的问题是各个变量的数值未知,由于只有5个变量,总共只有32总可能,所以暴力跑一遍即可,每种取值都试一次. #include<iostream> #include…

题目链接:http://poj.org/problem?id=3295 题意: 输入由p.q.r.s.t.K.A.N.C.E共10个字母组成的逻辑表达式, 其中p.q.r.s.t的值为1(true)或0(false),即逻辑变量: K.A.N.C.E为逻辑运算符, K --> and:  x && y A --> or:  x || y N --> not :  !x C --> implies :  (!x)||y E --> equals :  x==y…

Tautology Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10453   Accepted: 3967 Description WFF 'N PROOF is a logic game played with dice. Each die has six faces representing some subset of the possible symbols K, A, N, C, E, p, q, r, s…

POJ 3952,题目链接http://poj.org/problem?id=3295 题意: 输入由p.q.r.s.t.K.A.N.C.E共10个字母组成的逻辑表达式, 其中p.q.r.s.t的值为1(true)或0(false),即逻辑变量: K.A.N.C.E为逻辑运算符, K --> and:  x && y A --> or:  x || y N --> not :  !x C --> implies :  (!x)||y E --> equals …

Tautology Description WFF 'N PROOF is a logic game played with dice. Each die has six faces representing some subset of the possible symbols K, A, N, C, E, p, q, r, s, t. A Well-formed formula (WFF) is any string of these symbols obeying the followin…

题目链接. 分析: 最多有五个变量,所以枚举所有的真假值,从后向前借助于栈验证是否为永真式. #include <iostream> #include <cstring> #include <cstdio> #include <cstdlib> #include <stack> using namespace std; + ; stack<bool> S; char s[maxn]; ], ans; void check(char p…

给你一个表达式,其包括一些0,1变量和一些逻辑运算法,让你推断其是否为永真式. 计算表达式的经常使用两种方法:1.递归: 2.利用栈. code(递归实现) #include <cstdio> #include <cstring> #include <algorithm> #include <cmath> #include <string> using namespace std; char str[2000]; int pos; bool ca…

Description WFF 'N PROOF is a logic game played with dice. Each die has six faces representing some subset of the possible symbols K, A, N, C, E, p, q, r, s, t. A Well-formed formula (WFF) is any string of these symbols obeying the following rules: p…