mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
113 lines
2.0 KiB
C++
113 lines
2.0 KiB
C++
#include <stdio.h>
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#include <iostream>
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#include <sstream>
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#include <stdlib.h>
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#include <string>
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#include <vector>
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#include <set>
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#include <queue>
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#include <stack>
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#include <list>
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#include <math.h>
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#include <algorithm>
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#include <map>
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#include <string.h>
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using namespace std;
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typedef long long LL;
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typedef pair<int, int>PII;
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typedef pair<PII, int>PII2;
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string s;
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int n;
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int len;
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map<char, int>val;
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int value[20];
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int at;
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int good;
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int eva()
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{
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// cout << at << " " << s[at] << endl;
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if(good != 1) return 0;
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if(at >= len)
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{
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good = -2;
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}
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else if(s[at] >= 'a' && s[at] <= 'z')
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{
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return value[val[s[at++]]];
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}
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else if(s[at] >= 'A' && s[at] <= 'Z')
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{
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at++;
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int x, y;
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switch(s[at - 1])
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{
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case 'C': x = eva(); y = eva(); if(x && !y) return 0; else return 1;
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case 'N': x = eva(); return x ^ 1;
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case 'K': x = eva(); y = eva(); return x & y;
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case 'A': x = eva(); y = eva(); return x | y;
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case 'D': x = eva(); y = eva(); return !(x & y);
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case 'E': x = eva(); y = eva(); return (x == y);
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case 'J': x = eva(); y = eva(); return x ^ y;
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default: good = -1; break;
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}
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}
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else
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{
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good = -1;
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}
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}
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int main()
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{
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while(cin >> s)
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{
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good = 1;
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len = s.length();
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n = 0;
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val.clear();
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for(int i = 0; i < len; i++ )
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{
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if(s[i] >= 'a' && s[i] <= 'z' && val.find(s[i]) == val.end())
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{
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val[s[i]] = n++;
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}
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}
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int ct = 0, cn = 0;
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for(int i = 0; i < 1<<n && good == 1; i++ )
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{
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for(int j = 0; j < n; j++ )
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{
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if(i & (1<<j))
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value[j] = 1;
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else
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value[j] = 0;
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}
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at = 0;
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int res = eva();
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if(good == 1 && at < len) good = -3;
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if(res) ct++;
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else cn++;
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}
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cout << s << " is ";
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if(good == 1)
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{
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cout << "valid: ";
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if(ct && cn) cout << "contingent" << endl;
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else if(ct) cout << "tautology" << endl;
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else cout << "contradiction" << endl;
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}
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else if(good == -1)
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{
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cout << "invalid: invalid character" << endl;
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}
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else if(good == -2)
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{
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cout << "invalid: insufficient operands" << endl;
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}
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else
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{
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cout << "invalid: extraneous text" << endl;
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}
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}
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return 0;
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}
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