Thirty-four countries participated in a jury session of the IMO, each represented by the leader and the deputy leader of the team. Before the meeting, some participants exchanged handshakes, but no team leader shook hands with his deputy. After the meeting, the leader of the Illyrian team asked every other participant the number of people they had shaken hands with, and all the answers she got were different. How many people did the deputy leader of the Illyrian team greet ?
1. **Graph Representation and Initial Setup:**
   - Represent each participant as a vertex in a complete graph \( G \) with 68 vertices (34 countries, each with a leader and a deputy leader).
   - Color the edge \( p_i p_j \) blue if participants \( p_i \) and \( p_j \) shook hands, otherwise color it red.
   - Let \( p_i' \) be the deputy leader corresponding to leader \( p_i \) (i.e., \( p_i' \neq p_i \) and they are from the same country).
   - Define \( d(p_i) \) as the number of people \( p_i \) shook hands with.

2. **Constraints and Set Definitions:**
   - Since no team leader shook hands with their deputy, \( d(p_i) \leq 66 \) for all \( i \) (since there are 67 other participants).
   - Let \( L \) and \( D \) be the leader and deputy leader of Illyrian, respectively.
   - Define the set \( A = \{ p_1, p_2, \ldots, p_{68} \} - \{ L \} = \{ x_1, x_2, \ldots, x_{67} \} \).

3. **Distinct Handshake Counts:**
   - Since \( d(x_1), d(x_2), \ldots, d(x_{67}) \) are all distinct, we have \( \{ d(x_1), d(x_2), \ldots, d(x_{67}) \} = \{ 0, 1, 2, \ldots, 66 \} \).
   - Let \( q_i \in A \) such that \( d(q_i) = i \) for all \( i \), \( 0 \leq i \leq 66 \).

4. **Contradiction and Pairing:**
   - If \( q_{66} \) and \( q_0 \) are not from the same country, then the edges \( q_{66} q_{66}' \) and \( q_{66} q_0 \) are red and distinct, implying \( d(q_{66}) \leq 65 \), which is a contradiction. Thus, \( q_{66} = q_0' \).
   - The edge \( q_{66} q_1 \) must be blue, so \( q_{65} q_1 \) is red.
   - If \( q_{65} \neq q_1' \), then the edges \( q_{65} q_{65}' \), \( q_{65} q_1 \), and \( q_{65} q_0 \) are red and distinct, implying \( d(q_{65}) \leq 64 \), which is a contradiction. Thus, \( q_{65} = q_1' \).

5. **Iterative Pairing:**
   - By repeating this procedure, we can conclude that for each pair \( (a, b) \) from \( (q_{66}, q_0), (q_{65}, q_1), \ldots, (q_{34}, q_{32}) \), \( a \) and \( b \) are from the same country.
   - Since \( D \in A \) and \( L \notin A \), \( D = q_{33} \).

6. **Conclusion:**
   - Therefore, the deputy leader of the Illyrian team greeted 33 people.

The final answer is \( \boxed{33} \).