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View Compilation Error

0_0_38225027_7901.cpp: In function 'ar2 chg(ar2, int)':
0_0_38225027_7901.cpp:75:15: error: expected unqualified-id before '[' token
     for (auto [cur, nxt]: spin[dir]) {
               ^
0_0_38225027_7901.cpp:75:15: error: expected ';' before '[' token
0_0_38225027_7901.cpp:75:16: error: 'cur' was not declared in this scope
     for (auto [cur, nxt]: spin[dir]) {
                ^
0_0_38225027_7901.cpp:75:21: error: 'nxt' was not declared in this scope
     for (auto [cur, nxt]: spin[dir]) {
                     ^
0_0_38225027_7901.cpp: In lambda function:
0_0_38225027_7901.cpp:75:25: error: expected '{' before ':' token
     for (auto [cur, nxt]: spin[dir]) {
                         ^
0_0_38225027_7901.cpp: In function 'ar2 chg(ar2, int)':
0_0_38225027_7901.cpp:75:25: error: expected ';' before ':' token
0_0_38225027_7901.cpp:75:25: error: expected primary-expression before ':' token
0_0_38225027_7901.cpp:75:25: error: expected ')' before ':' token
0_0_38225027_7901.cpp:75:25: error: expected primary-expression before ':' token


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