http://poj.org/problem?id=2458 #include "stdio.h" char map[6][6]; bool sign[6][6]; int flag[6][6]; bool inline inmap( int x, int y ) { return 0<=x&&x<5&&0<=y&&y<5; } int dx[]={ 0,-1, 0, 1}; int dy[]={-1, 0, 1, 0}; int ans; int reach; int visit; void find( int x, int y ) { int i, xx, yy; reach++; flag[x][y] = visit; for( i=0; i<4; i++ ) if( inmap( xx=x+dx[i], yy=y+dy[i] ) && !sign[xx][yy] && flag[xx][yy] < visit ) { find( xx, yy ); if( reach == 7 ) return; } } void search( int j , int step , int J, int H ) { int i = j; if( H >= 4 )return; if( step == 7 ) { reach = 0; visit++; find( i/5, i%5 ); if( reach == 7 ) ans++; return; } for( i++; i<25 &&( j<0 || ( i/5 - j/5 ) <= 1 ); i++ ) { sign[i/5][i%5] = false; search( i, step+1, J+(int)(map[i/5][i%5]=='J'), H+(int)(map[i/5][i%5]=='H') ); sign[i/5][i%5] = true; } } int main() { int i, j; for( i=0; i<5; i++ ) scanf( "%s", map[i] ); for( i=0; i<5; i++ ) for( j=0; j<5; j++ ) { sign[i][j] = true; flag[i][j] = 0; } ans = 0;visit = 0; search( -1, 0, 0, 0 ); printf( "%dn", ans ); return 0; }
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