为什么全是WA？

#include<iostream>   //wangqicheng1637の水印
#include<bits/stdc++.h>
using namespace std;
const int N = 1000100;
long long int n, m, a[N];
long long cnt[N];
int main()
{
	cin >> n >> m;
	for ( int i = 1; i <= n; i ++ )
	{
		cin >> a[i];
	}
	long long l = 1, r = 0;
	long long tmp = 0, x, y;
	while(1)
	{
		while ( tmp < m && r < n )
		{
			if ( cnt[a[r++]]++ == 0 )
			{
				tmp ++;
			}
		} 
		if ( tmp < m )
		{
			break;
		}
		if ( r - l + 1 < y - x + 1 )
		{
			y = r, x = l;
		}
		if ( -- cnt[a[l++]] == 0 )
		{
			tmp --;
		}
	}
	cout << x << " " << y;
	return 0;
}