C语言程序：根据条件生成唯一值班表

#include <stdio.h>

int main() { int n; scanf("%d", &n);

// 初始化值班表，0表示未确定值班人员
int schedule[7] = {0, 0, 0, 0, 0, 0, 0};

// 处理每个条件
for (int i = 0; i < n; i++) {
    char doctor1, doctor2;
    char op; // 比较运算符
    int days;

    scanf(" %c%c%c%d", &doctor1, &op, &doctor2, &days);

    if (op == '>') {
        // doctor1 晚于 doctor2
        if (schedule[days % 7] != 0) {
            // 当前天已有值班人员，检查是否与 doctor1 相同
            if (schedule[days % 7] != doctor1) {
                printf("impossible\n");
                return 0;
            }
        } else {
            schedule[days % 7] = doctor1;
        }
    } else if (op == '<') {
        // doctor1 早于 doctor2
        if (schedule[days % 7] != 0) {
            // 当前天已有值班人员，检查是否与 doctor2 相同
            if (schedule[days % 7] != doctor2) {
                printf("impossible\n");
                return 0;
            }
        } else {
            schedule[days % 7] = doctor2;
        }
    } else if (op == '=') {
        // doctor1 在指定天值班
        if (schedule[days % 7] != 0) {
            // 当前天已有值班人员，检查是否与 doctor1 相同
            if (schedule[days % 7] != doctor1) {
                printf("impossible\n");
                return 0;
            }
        } else {
            schedule[days % 7] = doctor1;
        }
    }
}

// 输出值班表
printf("Monday: %c\n", schedule[0]);
printf("Tuesday: %c\n", schedule[1]);
printf("Wednesday: %c\n", schedule[2]);
printf("Thursday: %c\n", schedule[3]);
printf("Friday: %c\n", schedule[4]);
printf("Saturday: %c\n", schedule[5]);
printf("Sunday: %c\n", schedule[6]);

return 0;

}