View Compilation Error

0_0_37848847_17213.cpp: In function 'int solve()':
0_0_37848847_17213.cpp:70:18: error: expected unqualified-id before '[' token
         for(auto [u,v]:t[i]){
                  ^
0_0_37848847_17213.cpp:70:18: error: expected ';' before '[' token
0_0_37848847_17213.cpp:70:19: error: 'u' was not declared in this scope
         for(auto [u,v]:t[i]){
                   ^
0_0_37848847_17213.cpp:70:21: error: 'v' was not declared in this scope
         for(auto [u,v]:t[i]){
                     ^
0_0_37848847_17213.cpp: In lambda function:
0_0_37848847_17213.cpp:70:23: error: expected '{' before ':' token
         for(auto [u,v]:t[i]){
                       ^
0_0_37848847_17213.cpp: In function 'int solve()':
0_0_37848847_17213.cpp:70:23: error: expected ';' before ':' token
0_0_37848847_17213.cpp:70:23: error: expected primary-expression before ':' token
0_0_37848847_17213.cpp:70:23: error: expected ')' before ':' token
0_0_37848847_17213.cpp:70:23: error: expected primary-expression before ':' token