View Compilation Error

0_0_37851190_1578.cpp: In function 'void solve()':
0_0_37851190_1578.cpp:47:12: error: expected unqualified-id before '[' token
   for(auto [x, y] : barrel[i]) {
            ^
0_0_37851190_1578.cpp:47:12: error: expected ';' before '[' token
0_0_37851190_1578.cpp:47:13: error: 'x' was not declared in this scope
   for(auto [x, y] : barrel[i]) {
             ^
0_0_37851190_1578.cpp:47:16: error: 'y' was not declared in this scope
   for(auto [x, y] : barrel[i]) {
                ^
0_0_37851190_1578.cpp: In lambda function:
0_0_37851190_1578.cpp:47:19: error: expected '{' before ':' token
   for(auto [x, y] : barrel[i]) {
                   ^
0_0_37851190_1578.cpp: In function 'void solve()':
0_0_37851190_1578.cpp:47:19: error: expected ';' before ':' token
0_0_37851190_1578.cpp:47:19: error: expected primary-expression before ':' token
0_0_37851190_1578.cpp:47:19: error: expected ')' before ':' token
0_0_37851190_1578.cpp:47:19: error: expected primary-expression before ':' token