View Compilation Error

0_0_14919835_24897.cpp:8:22: error: conflicting declaration 'std::vector<std::vector<int> > str'
 vector<vector<int> > str;
                      ^
0_0_14919835_24897.cpp:7:5: note: previous declaration as 'int str [1501][1501]'
 int str[1501][1501];
     ^