View Compilation Error

0_0_33268920_19108.cpp: In function 'int main()':
0_0_33268920_19108.cpp:38:9: error: 't' was not declared in this scope
         t[0] = build(1, len);
         ^
0_0_33268920_19108.cpp:38:25: error: 'len' was not declared in this scope
         t[0] = build(1, len);
                         ^