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class Solution {
public:
    int numberOfSubarrays(vector<int>& v, int k) {
 
         unordered_map<int ,int> m;
 
        for(int i=0;i<v.size();++i)
        {
            if(v[i]&1)
                v[i]=1;
 
            else
                v[i]=0;
        }
 
        int sum=0,i,cnt=0;
        for(i=0;i<v.size();++i)
        {
            sum+=v[i];
            if(sum==k)
                cnt++;
 
            if(m.find(sum-k)!=m.end())
                cnt+=m[sum-k];
 
            m[sum]++;
        }
 
        return cnt;
 
 
    }
};

prog.cpp:3:27: error: no template named 'vector'
    int numberOfSubarrays(vector<int>& v, int k) {
                          ^
prog.cpp:5:10: error: use of undeclared identifier 'unordered_map'
         unordered_map<int ,int> m;
         ^
prog.cpp:5:28: error: expected '(' for function-style cast or type construction
         unordered_map<int ,int> m;
                       ~~~ ^
prog.cpp:23:16: error: use of undeclared identifier 'm'
            if(m.find(sum-k)!=m.end())
               ^
prog.cpp:23:31: error: use of undeclared identifier 'm'
            if(m.find(sum-k)!=m.end())
                              ^
prog.cpp:24:22: error: use of undeclared identifier 'm'
                cnt+=m[sum-k];
                     ^
prog.cpp:26:13: error: use of undeclared identifier 'm'
            m[sum]++;
            ^
7 errors generated.

Standard output is empty