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Code: Select all

#include<iostream>
using namespace std;
int rank[1000000];

void main()
{
	long a, b, c;

	while (cin>>a>>b)
	{
		//Calculate & Track for max
		int max = 0;
		for (int i = a; i <= b; i++)
		{
			if (rank[i] == 0)
				rank[i] = findrank(i);
			if (max < rank[i])
				max = rank[i];
		}
		//Print out
		cout << max;
	}
}

int findrank(int& x)
{
	int rank, next;
	if (x == 1)
	{
		rank = 0;
	}
	else
	{
		if (x % 2 == 0)
			next = x/2;
		else
			next = x*3+1;

		if (next > 1000000 || rank[next] == 0)
			rank = 1 + findrank[next];
		else
			rank = 1 + rank[next];
	}

	if (x < 1000001)
		rank[x] = rank;

	return rank;
}

Code: Select all

rank = 1 + rank[next];

Code: Select all

laputa.cc:5: error: `main' must return `int'
laputa.cc: In function `int main(...)':
laputa.cc:16: error: `findrank' undeclared (first use this function)
laputa.cc:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
laputa.cc: In function `int findrank(int&)':
laputa.cc:26: error: `int findrank(int&)' used prior to declaration
laputa.cc:39: error: invalid types `int[int]' for array subscript
laputa.cc:40: error: pointer to a function used in arithmetic
laputa.cc:40: error: pointer to a function used in arithmetic
laputa.cc:40: error: invalid conversion from `int (*)(int&)' to `int'
laputa.cc:42: error: invalid types `int[int]' for array subscript
laputa.cc:46: error: invalid types `int[int]' for array subscript