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class Solution {
public:
    int minSubarray(vector<int>& a, int p) {
 
         int i,n=a.size();
       // cout<<n<<endl;
        vector<int>front(n,0),back(n,0);
 
 
        front[0]=a[0]%p;
        back[n-1]=a[n-1]%p;
 
 
        for(i=1;i<n;i++)
       front[i]=(front[i-1]+a[i])%p;
 
 
         for(i=n-2;i>=0;i--)
        back[i]=(back[i+1]+a[i])%p;
 
 
 
        unordered_map<int,set<int>>mm;
 
 
        for(i=n-1;i>=0;i--)
        {
            mm[back[i]].insert(i);
 
        }
 
 
          if(front[n-1]%p==0)
              return 0;
 
        int ans=n;
 
        for(i=0;i<n;i++)
        {
            int rem1=front[i];
 
            if(rem1==0)
           ans=min(ans,n-i-1);
 
            if(back[i]==0)
            ans=min(ans,i);
 
            int rem2=(p-front[i])%p;
 
            if(mm[rem2].size()!=0)
            {
                auto it=mm[rem2].upper_bound(i);
 
                 if(it!=mm[rem2].end())
                  ans=min(ans,*it-i-1);
 
            }
        }
 
        if(ans==n)
        ans=-1;
 
        return ans;
 
 
 
 
 
 
    }
};

prog.cpp:3:21: error: ‘vector’ has not been declared
     int minSubarray(vector<int>& a, int p) {
                     ^~~~~~
prog.cpp:3:27: error: expected ‘,’ or ‘...’ before ‘<’ token
     int minSubarray(vector<int>& a, int p) {
                           ^
prog.cpp: In member function ‘int Solution::minSubarray(int)’:
prog.cpp:5:18: error: ‘a’ was not declared in this scope
          int i,n=a.size();
                  ^
prog.cpp:7:9: error: ‘vector’ was not declared in this scope
         vector<int>front(n,0),back(n,0);
         ^~~~~~
prog.cpp:7:16: error: expected primary-expression before ‘int’
         vector<int>front(n,0),back(n,0);
                ^~~
prog.cpp:10:9: error: ‘front’ was not declared in this scope
         front[0]=a[0]%p;
         ^~~~~
prog.cpp:10:9: note: suggested alternative: ‘float’
         front[0]=a[0]%p;
         ^~~~~
         float
prog.cpp:10:23: error: ‘p’ was not declared in this scope
         front[0]=a[0]%p;
                       ^
prog.cpp:11:9: error: ‘back’ was not declared in this scope
         back[n-1]=a[n-1]%p;
         ^~~~
prog.cpp:23:9: error: ‘unordered_map’ was not declared in this scope
         unordered_map<int,set<int>>mm;
         ^~~~~~~~~~~~~
prog.cpp:23:23: error: expected primary-expression before ‘int’
         unordered_map<int,set<int>>mm;
                       ^~~
prog.cpp:28:13: error: ‘mm’ was not declared in this scope
             mm[back[i]].insert(i);
             ^~
prog.cpp:43:16: error: ‘min’ was not declared in this scope
            ans=min(ans,n-i-1);
                ^~~
prog.cpp:46:17: error: ‘min’ was not declared in this scope
             ans=min(ans,i);
                 ^~~
prog.cpp:50:16: error: ‘mm’ was not declared in this scope
             if(mm[rem2].size()!=0)
                ^~
prog.cpp:55:23: error: ‘min’ was not declared in this scope
                   ans=min(ans,*it-i-1);
                       ^~~

Standard output is empty