For positive integers $m$ and $n$, find the smalles possible value of $|2011^m-45^n|$.

[i](Swiss Mathematical Olympiad, Final round, problem 3)[/i]
To find the smallest possible value of \( |2011^m - 45^n| \) for positive integers \( m \) and \( n \), we will analyze the expression step-by-step.

1. **Initial Bound and Parity Analysis:**
   - Let \( d \) be the minimum possible value of \( |2011^m - 45^n| \).
   - We observe that \( d \leq 14 \) because \( 14 = |2011^1 - 45^2| \).
   - Since \( 2011^m \) and \( 45^n \) are both odd, their difference \( 2011^m - 45^n \) is even. Thus, \( d \) must be even.

2. **Divisibility Analysis:**
   - \( 2011 \equiv 1 \pmod{5} \), so \( 2011^m \equiv 1 \pmod{5} \) for any \( m \).
   - \( 45 \equiv 0 \pmod{5} \), so \( 45^n \equiv 0 \pmod{5} \) for any \( n \).
   - Therefore, \( 2011^m - 45^n \equiv 1 \pmod{5} \), meaning \( d \equiv 1 \pmod{5} \).

3. **Possible Values for \( d \):**
   - Since \( d \) is even and \( d \equiv 1 \pmod{5} \), the possible values for \( d \) are \( 2, 4, 8, 14 \).
   - However, \( d \equiv 1 \pmod{5} \) eliminates \( 2 \) and \( 8 \) from consideration, leaving \( d = 4 \) or \( d = 14 \).

4. **Case Analysis for \( d = 4 \):**
   - **Case 1: \( 2011^m - 45^n = 4 \)**
     - \( 45^n \equiv 1 \pmod{4} \) because \( 45 \equiv 1 \pmod{4} \).
     - \( 2011 \equiv -1 \pmod{4} \), so \( 2011^m \equiv (-1)^m \pmod{4} \).
     - For \( 2011^m \equiv 1 \pmod{4} \), \( m \) must be even, say \( m = 2a \).
     - This gives \( (2011^a - 2)(2011^a + 2) = 3^{2n} \cdot 5^n \).
     - Since \( 2011^a - 2 \) and \( 2011^a + 2 \) differ by 4, one must be divisible by \( 3^{2n} \) and the other by \( 5^n \).
     - However, solving \( 9^n - 2^n = 4 \) gives \( n = 1 \), but no suitable \( a \) exists.

   - **Case 2: \( 45^n - 2011^m = 4 \)**
     - \( 45^n - 4 \equiv 2 \pmod{3} \) because \( 45 \equiv 0 \pmod{3} \).
     - \( 2011 \equiv 1 \pmod{3} \), so \( 2011^m \equiv 1 \pmod{3} \).
     - This leads to a contradiction since \( 2 \not\equiv 1 \pmod{3} \).

5. **Conclusion:**
   - Both cases for \( d = 4 \) are impossible.
   - Therefore, the smallest possible value of \( d \) is \( 14 \).

The final answer is \(\boxed{14}\).