http://poj.org/problem?id=2837 #include <stdio.h> int ans[512][512]; int main( ) { int i, j, k, n; ans[0][0] = 1; scanf( "%d", &n ); for( i=1; i<(1<<n); i<<=1 ) { for( j=i; j<i*2; j++ ) for( k=i; k<i*2; k++ ) ans[j][k] = ans[j-i][k-i]; for( j=0; j<i; j++ ) for( k=i; k<i*2; k++ ) ans[j][k] = ans[j][k-i] + i*2; for( j=i; j<i*2; j++ ) for( k=0; k<i; k++ ) ans[j][k] = ans[j-i][k] + i*2 + (j-i==k?-1:0); } for( i=0; i<(1<<n); i++ ) for( j=0; j<(1<<n); j++ ) printf( "%d%c", ans[i][j], j==(1<<n)-1?'n':' ' ); return 0; }
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