View Compilation Error

0_0_33377113_5521.cpp: In function 'int sol()':
0_0_33377113_5521.cpp:171:17: error: 'build' was not declared in this scope
  build(1, 1, n+1);
                 ^
0_0_33377113_5521.cpp: In function 'int solve()':
0_0_33377113_5521.cpp:199:1: error: expected primary-expression before '%' token
0_0_33377113_5521.cpp:199:1: error: expected primary-expression at end of input
0_0_33377113_5521.cpp:199:1: error: expected '}' at end of input