运行 ID: 30774

Main.cc: In function ‘void DSU::undo(int)’:
Main.cc:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(ops.size() > ver){
               ~~~~~~~~~~~^~~~~
Main.cc:63:18: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
             auto [x, px, szx, sumx, upx] = ops.back();
                  ^
Main.cc: In function ‘void solve(int, int, int)’:
Main.cc:76:14: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
     for(auto [a, b] : tr[u]){
              ^
Main.cc: In function ‘int main()’:
Main.cc:119:20: error: use of ‘auto’ in lambda parameter declaration only available with -std=c++14 or -std=gnu++14
     auto dfs = [&](auto &&dfs, int u) -> void {
                    ^~~~
Main.cc: In lambda function:
Main.cc:125:23: error: expression cannot be used as a function
             dfs(dfs, j);
                       ^
Main.cc: In function ‘int main()’:
Main.cc:130:15: error: no match for call to ‘(main()::) (main()::&, int)’
     dfs(dfs, 1);
               ^
Main.cc:119:42: note: candidate: main()::
     auto dfs = [&](auto &&dfs, int u) -> void {
                                          ^~~~
Main.cc:119:42: note:   no known conversion for argument 1 from ‘main()::’ to ‘int&&’