代码

#include <bits/stdc++.h>
typedef unsigned int u32;
inline int lowbit(int x){return x&-x;}
const int N=1024;
alignas(4096) int B[(N+5)*(N+5)];
void matrix_multiply(int n,const int *A,const int *B_,int *C){
	for(int i=0;i<n;++i){
		for(int j=0;j<i;++j){
			B[i*n+j]=B_[j*n+i];
			B[j*n+i]=B_[i*n+j];
		}
	}
}

评测结果