View Compilation Error

0_0_7974154_6058.cpp:12: error: expected constructor, destructor, or type conversion before "bool"
0_0_7974154_6058.cpp:12: error: expected `,' or `;' before "bool"
0_0_7974154_6058.cpp: In function `void ef(ll, ll)':
0_0_7974154_6058.cpp:39: error: `f' undeclared (first use this function)
0_0_7974154_6058.cpp:39: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_7974154_6058.cpp: In function `int main()':
0_0_7974154_6058.cpp:51: error: `v' undeclared (first use this function)