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Vectors and Maps

Vectors and Maps

Vector and Map

💡 Note

vector is a dynamic array (grows automatically). map stores sorted key-value pairs.

Vector

C++
#include <vector>
vector<int> v;
v.push_back(10);
v.push_back(20);
cout << v[0] << " " << v.size();   // 10 2
Output:
10 2

Map

C++
#include <map>
map<string,int> m;
m["Aman"] = 88;
m["Riya"] = 92;
cout << m["Aman"];   // 88
Output:
88

Summary

  • vector = resizable array with push_back, size, [].
  • map = key-value store, automatically sorted by key.

Vector and Map

💡 Note

vector is a dynamic array (grows automatically). map stores sorted key-value pairs.

Vector

C++
#include <vector>
vector<int> v;
v.push_back(10);
v.push_back(20);
cout << v[0] << " " << v.size();   // 10 2
Output:
10 2

Map

C++
#include <map>
map<string,int> m;
m["Aman"] = 88;
m["Riya"] = 92;
cout << m["Aman"];   // 88
Output:
88

सारांश

  • vector = resizable array with push_back, size, [].
  • map = key-value store, automatically sorted by key.
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