题解 | #扑克牌大小#

分模块写比较繁琐，代码量较多，不过不容易出问题，也容易调试。

#include <iostream>
#include <cstring>
using namespace std;

void get_card(string &left, string &right) {
    string s;
    getline(cin, s);
    int i = s.find('-');
    left = s.substr(0, i);
    right = s.substr(i+1, s.length());
}

typedef enum {
    ONE = 0,
    TWO,
    THREE,
    BOMB,
    CONT,
    JOKER
} CARD;

int card_value(string card) {
    const string tb = "#34567891JQKA2";
    string s;
    for (auto i = card.begin(); i != card.end() && *i != ' '; i++) {
        s.push_back(*i);
    }
    if (s.length() == 5) { /* 除JOKER牌，其他查表，索引表示牌的大小 */
        return 0;
    } else {
        return tb.find(s[0]);
    }
}

int card_type(string card) {

    int cnt = 1;
    for (auto i = card.begin(); i != card.end(); i++) {
        if (' ' == *i) {
            cnt++;
        }
    }
    if (1 == cnt) {
        return ONE;
    } else if (2 == cnt) {
        if (11 == card.length()) {
            return JOKER;
        } else {
            return TWO;
        }
    } else if (3 == cnt) {
        return THREE;
    } else if (4 == cnt) {
        return BOMB;
    } else if (5 == cnt) {
        return CONT;
    }
} 

int cmp_large(string &left, string &right) {

    int l = card_value(left);
    int r = card_value(right);

    int type_left = card_type(left);
    int type_right = card_type(right);

    /* 如果是对王最大 */
    if (JOKER == type_left) {
        return 1;
    } else if (JOKER == type_right) {
        return -1;
    }

    /* 都不是对王，如果都是炸弹 */
    if (BOMB == type_left && BOMB == type_right) {
        if (l > r) {
            return 1;
        } else if (l < r) {
            return -1;
        } else {
            return 0;
        }
    }
    if (BOMB == type_left) {
        return 1;
    } else if (BOMB == type_right) {
        return -1;
    }

    /* 剩下的同种类型才可相互比较 */
    if (type_left == type_right) {
        if (l > r) {
            return 1;
        } else if (l < r) {
            return -1;
        } else {
            return 0;
        }
    } else {
        return 0;
    }
}

int main() {

    string left;
    string right;
    get_card(left, right);
    int res = cmp_large(left, right);
    if (1 == res) {
        cout << left;
    } else if (-1 == res) {
        cout << right;
    } else {
        cout << "ERROR";
    }
    return 0;
}