提交记录 15016 - Judge Duck Online

用户	题目	状态	得分	用时	内存	语言	代码长度
AzusaCat	mmmd1k. 测测你的双精度矩阵乘法-1k	Compile Error	0	0 ns	0 KB	C++	290 B

提交时间	评测时间
2020-11-14 15:43:28	2020-11-14 15:43:29

代码

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

void matrix_multiply(int n, const double *A, const double *B, double *C) {
	for (int i = 0; i < n; i++) {
		for (int k = 0; k < n; k++) {
			C[idx(i, j)] = 0;
			for (int j = 0; j < n; j++) {
				C[idx(i, j)] += A[idx(i, k)] * B[idx(k, j)];
			}
		}
	}
}

评测结果

Compilation

N/A

Compile Error

Score: N/A

显示更多

jp_data/tasks/161d2aec264d11ebb5e000163e04388b/contestant.cpp: In function ‘void matrix_multiply(int, const double*, const double*, double*)’:
jp_data/tasks/161d2aec264d11ebb5e000163e04388b/contestant.cpp:6:13: error: ‘j’ was not declared in this scope
    6 |    C[idx(i, j)] = 0;
      |             ^
jp_data/tasks/161d2aec264d11ebb5e000163e04388b/contestant.cpp:1:31: note: in definition of macro ‘idx’
    1 | #define idx(i, j) ((i) * n + (j))
      |                               ^