View Compilation Error

0_0_15899515_29362.cpp: In function 'int main()':
0_0_15899515_29362.cpp:129:37: error: 'class std::vector<std::pair<int, int> >' has no member named 'begi'
                 it=lower_bound(v[z].begi
                                     ^
0_0_15899515_29362.cpp:129:37: error: expected '}' at end of input
0_0_15899515_29362.cpp:129:37: error: expected '}' at end of input
0_0_15899515_29362.cpp:129:37: error: expected '}' at end of input
0_0_15899515_29362.cpp:129:37: error: expected '}' at end of input