<commit_before>public class TrafficCongestionDivTwo {
	long[] table = new long[100];
	public long theMinCars(int treeHeight) {
if(table[treeHeight] > 0)
	return table[treeHeight];
		if(treeHeight == 0 || treeHeight == 1)
			return 1;
		else {
			long sum= 0;
			
			for(int i=0;i<=treeHeight - 2;i++){
				sum = sum + theMinCars(i);
				
			}
			table[treeHeight] = 1 + 2*(sum);
			return table[treeHeight];
		}
	}

}<commit_msg>Made SRM 585 DIV 2 solution more efficient.It passes DIV 1 test cases now.<commit_after>public class TrafficCongestion {
	long[] table = new long[1000001];
	public long theMinCars(int treeHeight) {
		table[0] = 1;
		table[1] = 1;
		for(int i=2;i<=treeHeight;i++){
			table[i] = (2*table[i-2]+table[i-1])% 1000000007;
		}
		
		return table[treeHeight];
		
	}
};
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