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View Compilation Error

0_0_38145319_20784.cpp: In function 'void dij(Graph&, std::vector<long long int>&, int)':
0_0_38145319_20784.cpp:20:19: error: expected unqualified-id before '[' token
         for(auto &[to,a,b]:graph.graph[u]){
                   ^
0_0_38145319_20784.cpp:20:19: error: expected ';' before '[' token
0_0_38145319_20784.cpp:20:20: error: 'to' was not declared in this scope
         for(auto &[to,a,b]:graph.graph[u]){
                    ^
0_0_38145319_20784.cpp:20:23: error: 'a' was not declared in this scope
         for(auto &[to,a,b]:graph.graph[u]){
                       ^
0_0_38145319_20784.cpp:20:25: error: 'b' was not declared in this scope
         for(auto &[to,a,b]:graph.graph[u]){
                         ^
0_0_38145319_20784.cpp: In lambda function:
0_0_38145319_20784.cpp:20:27: error: expected '{' before ':' token
         for(auto &[to,a,b]:graph.graph[u]){
                           ^
0_0_38145319_20784.cpp: In function 'void dij(Graph&, std::vector<long long int>&, int)':
0_0_38145319_20784.cpp:20:27: error: expected ';' before ':' token
0_0_38145319_20784.cpp:20:27: error: expected primary-expression before ':' token
0_0_38145319_20784.cpp:20:27: error: expected ')' before ':' token
0_0_38145319_20784.cpp:20:27: error: expected primary-expression before ':' token


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