What Is WAP Data Structure?


Scott Campbell

What Is WAP Data Structure?

In the world of computer science and programming, data structures play a crucial role in organizing and storing data efficiently. One such data structure is the WAP (Weighted Adjacency Pair) data structure.

Understanding WAP

WAP is a specialized data structure used to represent weighted graphs. Graphs, in simple terms, consist of a set of vertices connected by edges. These edges can have weights associated with them, representing the cost or distance between the vertices.

WAP represents this graph structure by storing pairs of adjacent vertices and their corresponding weights. Each pair is represented as (v, w), where v is a vertex and w is the weight associated with the edge connecting it to another vertex.

Benefits of WAP

The WAP data structure offers several benefits:

  • Efficient Storage: WAP efficiently stores only the necessary information about the graph, reducing memory usage compared to other representations.
  • Fast Access: With direct access to each pair in the data structure, retrieving specific weights or vertices becomes faster.
  • Flexibility: WAP allows for easy modifications to the graph by adding or removing pairs as needed.

Implementation of WAP

To implement WAP, you can use various programming languages such as C++, Java, or Python. Here’s an example implementation using C++:

#include <iostream>
#include <vector>

using namespace std;

struct WeightedAdjacencyPair {
    int vertex;
    int weight;

vector<vector<WeightedAdjacencyPair>> wap;

void addPair(int v, int u, int weight) {
    wap[v].push_back({u, weight});

int main() {
    // Initialize the WAP data structure
    int numVertices = 5;
    // Add pairs to represent the graph
    addPair(0, 1, 10);
    addPair(0, 2, 5);
    addPair(1, 2, 3);
    addPair(2, 3, 7);
    // Accessing the pairs
    cout << "Weight between vertex 0 and vertex 1: " << wap[0][0].weight << endl;
    return 0;

In this example implementation, we define a struct called WeightedAdjacencyPair to represent each pair in the WAP. We use a vector of vectors to store the pairs for each vertex.

The addPair function is used to add new pairs to the data structure. Finally, we can access specific weights or vertices by directly accessing the corresponding elements in the vector.


The WAP data structure provides an efficient way to represent weighted graphs. It offers benefits such as efficient storage and fast access to graph information. By understanding and implementing WAP in your programs, you can effectively work with weighted graphs and solve various graph-related problems.

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