给定n,m(200),构造一个n*m的矩阵a,使得每个4*4的子矩阵,左上角2*2的子矩阵的异或和等于右下角的,左下角的异或和等于右上角的
题目#includeusingnamespacestd;#defineintlonglong#definepbpush_back#definefifirst#definesesecond#definelsonpn||j+4-1>m)continue;intt=a[i][j]^a[i][j+1]^a[i+1][j]^a[i+1][j+1];intt2=a[i+2][j+2]^a[i+2][j+1+2