提交记录 16113 - Judge Duck Online

用户	题目	状态	得分	用时	内存	语言	代码长度
Alphagocc	mmmd1k. 测测你的双精度矩阵乘法-1k	Compile Error	0	0 ns	0 KB	C++	472 B

提交时间	评测时间
2021-03-27 13:13:18	2021-03-27 13:13:19

代码

#define idx(i, j) ((i) * n + (j))

void matrix_multiply(int n, const double *A, const double *B, double *C) {
	for (int k = 0; k < n; ++k) {
        for (int i = 0; i < n; ++i) {
            double r = a[i][k];
            for (int j = 0; j < n; j += 4) {
                c[i][j] += r * b[k][j];
                c[i][j + 1] += r * b[k][j + 1];
                c[i][j + 2] += r * b[k][j + 2];
                c[i][j + 3] += r * b[k][j + 3];
            }
        }
    }
}

评测结果

Compilation

N/A

Compile Error

Score: N/A

显示更多

jp_data/tasks/24b2e4308ebb11eb8d96fdb470a28eb4/contestant.cpp: In function ‘void matrix_multiply(int, const double*, const double*, double*)’:
jp_data/tasks/24b2e4308ebb11eb8d96fdb470a28eb4/contestant.cpp:6:24: error: ‘a’ was not declared in this scope
    6 |             double r = a[i][k];
      |                        ^
jp_data/tasks/24b2e4308ebb11eb8d96fdb470a28eb4/contestant.cpp:8:17: error: ‘c’ was not declared in this scope
    8 |                 c[i][j] += r * b[k][j];
      |                 ^
jp_data/tasks/24b2e4308ebb11eb8d96fdb470a28eb4/contestant.cpp:8:32: error: ‘b’ was not declared in this scope
    8 |                 c[i][j] += r * b[k][j];
      |                                ^