Forgetting to initialize the locked or preferences arrays properly before use.
// Function to read input void read_input(int *voters, int *candidates, voter_t **voters_prefs) // Read in the number of voters and candidates scanf("%d %d", voters, candidates);
Before locking a pair, you must search the graph to see if the loser can already reach the winner through existing paths. Implementing the Recursion Helper Function
// Reset pair_count to ensure it starts from 0 pair_count = 0; // Loop through all pairs of candidates for (int i = 0; i < candidate_count; i++) Cs50 Tideman Solution
// Global arrays int preferences[MAX][MAX]; bool locked[MAX][MAX];
Sort the pairs array in descending order based on the strength of victory.
The algorithm creates a list of all head-to-head matchups and sorts them in descending order based on the strength of the victory. Forgetting to initialize the locked or preferences arrays
// Found the candidate with no incoming edges if (is_source)
: Updates a 2D array, preferences[i][j] , which tracks how many voters prefer candidate i over candidate j . 2. Identifying Winners ( add_pairs )
void record_preferences(int ranks[]) for (int i = 0; i < candidate_count; i++) for (int j = i + 1; j < candidate_count; j++) preferences[ranks[i]][ranks[j]]++; Use code with caution. 3. add_pairs The algorithm creates a list of all head-to-head
If a candidate appears earlier in ranks than another, the voter prefers them. Increment preferences[ranks[i]][ranks[j]] where i < j . 3. Add Pairs
Implement a sorting algorithm (Selection Sort or Bubble Sort work perfectly here) to rearrange the pairs array based on this margin. 5. Lock Pairs (The Boss Fight)
The program counts how many voters prefer Candidate A over Candidate B for every possible pair.
if (is_source)