View Compilation Error

0_0_38198967_23342.cpp: In function 'int main()':
0_0_38198967_23342.cpp:65:49: error: 'i' was not declared in this scope
                 int lb = lower_bound(vec[primes[i]].begin(), vec[primes[i]].end(), l) - vec[primes[i]].begin();
                                                 ^