# Got accepted by using vectors of map but not by arrays of map in c++.Can anyone explain why ?

• Hello guys while I was trying this solution and the solution got accepted when used vectors of map in c++ but when I used arrays of map I got TLE . I always thought that arrays are faster than vectors and even some sites say the same(https://hackernoon.com/c-investigation-arrays-vs-vectors-e9ba864468b6) . Can anyone explain why this happened?
My Source code with Arrays:

``````class Solution {
public:
int numberOfArithmeticSlices(vector<int>& A) {
if(A.size()<=2)
return 0;
int cnt=0;
map<long int,int> m[A.size()];
for(int i=0;i<A.size();i++){
for(int j=0;j<i;j++){
long int diff=(long)A[i]-(long)A[j];
if(diff>=INT_MAX || diff<=INT_MIN)
continue;
int val=m[j][diff];
m[i][diff]+=val+1;
cnt+=val;
}
}
return cnt;
}
};
``````

My Source code with Vectors:

``````class Solution {
public:
int numberOfArithmeticSlices(vector<int>& A) {
if(A.size()<=2)
return 0;
int cnt=0;
vector<map<int,int>> m(A.size());
for(int i=0;i<A.size();i++){
for(int j=0;j<i;j++){
long int diff=(long)A[i]-(long)A[j];
if(diff>=INT_MAX || diff<=INT_MIN)
continue;
int val=m[j][diff];
m[i][diff]+=val+1;
cnt+=val;
}
}
return cnt;
}
};
``````

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