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vector<int> dist(n, 1e9);
queue<int> q;
for (int i = 0; i < n; ++i)
{
    if (arr[i] == "source")
    {
        dist[i] = 0;
        q.push(i);
    }
}
 
while (q.size())
{
    int x = q.front();
    q.pop();
    for (auto &i : adj[x])
    {
    	if(dist[i] > dist[x] + 1)
    	{
    		q.push(i);
    		dist[i] = dist[x] + 1;
    	}
    }
}

prog.cpp:1:1: error: ‘vector’ does not name a type
 vector<int> dist(n, 1e9);
 ^~~~~~
prog.cpp:2:1: error: ‘queue’ does not name a type
 queue<int> q;
 ^~~~~
prog.cpp:3:1: error: expected unqualified-id before ‘for’
 for (int i = 0; i < n; ++i)
 ^~~
prog.cpp:3:17: error: ‘i’ does not name a type
 for (int i = 0; i < n; ++i)
                 ^
prog.cpp:3:24: error: expected unqualified-id before ‘++’ token
 for (int i = 0; i < n; ++i)
                        ^~
prog.cpp:12:1: error: expected unqualified-id before ‘while’
 while (q.size())
 ^~~~~

Standard output is empty