sort(D.begin(), D.end());
if(D.size() == 0 || IceBlock < D[0].s){
	printf("SORRY CIRNO,NOT ENOUGH ICE_BLOCKS TO FIX THE WALL\n");
	return;
}
DR = D[0];

如果没有门，那不就代表地下没用空缺吗？那为啥是冰块不够啊