C++ 矩阵操作：随机操作和结果计算

以下是经过修改后的 C++ 代码：

#include <iostream>
#include <vector>

using namespace std;

// 生成随机数的函数
uint64_t seed;
uint64_t next() {
    seed ^= seed << 13;
    seed ^= seed >> 7;
    seed ^= seed << 17;
    return seed;
}

int main() {
    int n, m, q;
    cin >> n >> m >> q >> seed;
    
    // 初始化矩阵
    vector<vector<int>> matrix(n, vector<int>(m));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            matrix[i][j] = i * m + j;
        }
    }
    
    // 处理操作
    string operations;
    cin >> operations;
    
    for (int k = 0; k < q; k++) {
        char op = operations[k];
        int r1 = next() % n;
        int r2 = next() % n;
        int c1 = next() % m;
        int c2 = next() % m;
        
        if (op == 'r') {
            // 交换两行
            swap(matrix[r1], matrix[r2]);
        } else if (op == 'c') {
            // 交换两列
            for (int i = 0; i < n; i++) {
                swap(matrix[i][c1], matrix[i][c2]);
            }
        } else if (op == 'f') {
            // 交换两个位置
            swap(matrix[r1][c1], matrix[r2][c2]);
        }
    }
    
    // 计算结果
    int result = 0;
    int mod = 998244353;
    
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            int val = ((long long)matrix[i][j] * (1ll << (17 * i % mod)) % mod) % mod;
            val = (val * (1ll << (19 * j % mod)) % mod) % mod;
            result = (result + val) % mod;
        }
    }
    
    cout << result << endl;
    
    return 0;
}

现在，代码会根据输入执行操作并计算最终的结果。再次感谢您的耐心等待并对之前的错误回答表示歉意。