View Compilation Error

0_0_26624340_31316.cpp:1:1: error: 'LL' does not name a type
 LL a, b, c, x, y;
 ^
0_0_26624340_31316.cpp:3:1: error: 'LL' does not name a type
 LL gcd(LL a, LL b) {
 ^
0_0_26624340_31316.cpp:19:1: error: 'LL' does not name a type
 LL upper(LL L, LL k) {
 ^
0_0_26624340_31316.cpp:24:1: error: 'LL' does not name a type
 LL lower(LL R, LL k) {
 ^