View Compilation Error

0_0_21685557_11825.cpp: In function 'int main()':
0_0_21685557_11825.cpp:35:34: error: 'max' is not a member of 'std'
     ans = 50 - 50 * R / sqrt((DB)std::max(mode1, mode2));
                                  ^
0_0_21685557_11825.cpp:47:22: error: expected ';' before ')' token
    BAC = acos(cosBAC));
                      ^
0_0_21685557_11825.cpp:48:22: error: expected ';' before ')' token
    ABC = acos(cosABC));
                      ^
0_0_21685557_11825.cpp:49:22: error: expected ';' before ')' token
    ACB = acos(cosACB));
                      ^