第27章 模拟算法

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main() {
    srand(time(0));        // 设置随机种子
    int count7 = 0;
    for (int i = 0; i < 10; i++) {
        int d1 = rand() % 6 + 1;
        int d2 = rand() % 6 + 1;
        if (d1 + d2 == 7) count7++;
    }
    cout << "点数和为 7 的次数：" << count7 << endl;
    return 0;
}

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main() {
    srand(time(0));
    int windows[3] = {0};          // 3 个窗口的"空闲时刻"
    for (int i = 0; i < 5; i++) { // 5 位客户
        int service = rand() % 5 + 1;
        int minT = windows[0], idx = 0;
        for (int j = 1; j < 3; j++)   // 找最早空闲窗口
            if (windows[j] < minT) { minT = windows[j]; idx = j; }
        int start = windows[idx];
        windows[idx] = start + service; // 更新该窗口空闲时刻
        cout << "客户" << i + 1 << " 窗口" << idx + 1
             << " 开始:" << start << " 结束:" << windows[idx] << endl;
    }
    return 0;
}

#include <iostream>
using namespace std;
int main() {
    int h = 12, m = 30, s = 0;
    for (int i = 0; i < 10; i++) {
        printf("%02d:%02d:%02d\n", h, m, s);
        s++;
        if (s == 60) { s = 0; m++; if (m == 60) { m = 0; h++; if (h == 24) h = 0; } }
    }
    return 0;
}

#include <iostream>
using namespace std;
int main() {
    double h = 10.0, total = 0.0;
    for (int i = 0; i < 5; i++) {
        total += h;                 // 下落
        if (i < 4) { h /= 2; total += h; } // 反弹（最后一次不反弹）
    }
    cout << "第5次落地总路程：" << total << " 米\n";
    cout << "第5次反弹高度：" << h / 2 << " 米\n"; // i=4 时 h 已是第5次落地后的反弹高
    return 0;
}