python/TangDou/XiTi/1342.cpp

#include <bits/stdc++.h>

using namespace std;

//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
class fourArithmeticOperation {

public:
    //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>
    string s;
    //<2F><><EFBFBD><EFBFBD>ջ
    stack<int> val;
    //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ
    stack<char> symbol;

    //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    fourArithmeticOperation() {
        symbol.push('#');
    }

    //<2F><><EFBFBD><EFBFBD>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD>Ĺ<EFBFBD><C4B9><EFBFBD>
    int process() {
        int i = 0, num;
        while (symbol.top() != '#' || i < s.size()) {
            //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
            if (s[i] >= '0' && s[i] <= '9') {
                //Ϊ<><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
                num = 0;
                //<2F><><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><D6B7><EFBFBD>תΪ<D7AA><CEAA><EFBFBD>ֵķ<D6B5><C4B7><EFBFBD>
                while (s[i] >= '0' && s[i] <= '9') {//һֱ<D2BB><D6B1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD>
                    num *= 10;
                    num += s[i] - '0';
                    ++i;
                }
                //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ
                val.push(num);
                //cout << num << "<22><>ջval" << endl;
            } else {
                switch (cmp(symbol.top(), s[i])) {
                    case '<':
                        symbol.push(s[i]);
                        //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ
                        // cout << s[i] << "<22><>ջsymbol" << endl;
                        ++i;
                        break;
                    case '=': //<2F><><EFBFBD><EFBFBD>ǰ<EFBFBD><C7B0><EFBFBD>ȺŶԵ<C5B6>
                        //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ
                        // cout << symbol.top() << "<22><>ջsymbol" << endl;
                        symbol.pop();
                        ++i;
                        break;
                    case '>':
                        int a = val.top();
                        val.pop();
                        int b = val.top();
                        //<2F><>ջ
                        // cout << b << "<22><>ջval" << endl;
                        val.pop();
                        val.push(cal(b, a, symbol.top()));
                        //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ
                        //  cout << a << symbol.top() << b << "=" << val.top() << endl;
                        // cout << val.top() << "<22><>ջval" << endl;
                        //<2F><>ջ
                        // cout << symbol.top() << "<22><>ջsymbol" << endl;
                        symbol.pop();
                        break;
                }
            }
        }
        int res = val.top();
        val.pop();
        return res;
    }


    //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><D6AE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȼ<EFBFBD><C8BC>ıȽ<C4B1>
    char cmp(char a, char b) {
        //<2F><><EFBFBD><EFBFBD><EFBFBD>Ų<EFBFBD><C5B2><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><D5BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><C5B5><EFBFBD><EFBFBD>ȼ<EFBFBD>
        //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ž͵<C5BE><CDB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
        if (a == '#') {
            if (b == '#') {
                return '=';
            } else {
                return '<';
            }
        }
        if (a == '+' || a == '-') {
            if (b == '*' || b == 'x' || b == 'X' || b == '/' || b == '(') {
                return '<';
            } else {
                return '>';
            }
        }
        if (a == '*' || a == 'x' || a == 'X' || a == '/') {
            if (b == '(') {
                return '<';
            } else {
                return '>';
            }
        }
        if (a == '(') {
            if (b == ')') {
                return '=';
            } else {
                return '<';
            }
        }
    }

//<2F><><EFBFBD>ؼ<EFBFBD><D8BC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    int cal(int a, int b, char op) {
        switch (op) {
            case '+':
                return a + b;
            case '-':
                return a - b;
            case 'x':
                return a * b;
            case 'X':
                return a * b;
            case '*':
                return a * b;
            case '/':
                return a / b;
        }
    }

};

int main() {
    fourArithmeticOperation s1;
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> s1.s;
        if (s1.process() == 24) {
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }
    }
    return 0;
}