Compilare: main.cpp: In function 'int main()': main.cpp:378:15: warning: unused variable 'val' [-Wunused-variable] int N, M, val, t, x, y; ^~~ main.cpp: In instantiation of 'Tinfo tree_decomposition::TreeDecomposition<Tinfo, Combiner>::query(int, int) [with Tinfo = int; Combiner = tree_decomposition::DefaultCombiner<int>]': main.cpp:398:50: required from here main.cpp:355:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses] if (parent_src == -1 || parent_dst != -1 && depth_[parent_src] < depth_[parent_dst]) main.cpp: In member function 'Tinfo segment_tree::SegmentTree<Tinfo, Combiner>::query(int, int) [with Tinfo = int; Combiner = tree_decomposition::DefaultCombiner<int>]': main.cpp:111:11: warning: 'ret_lsh' may be used uninitialized in this function [-Wmaybe-uninitialized] Tinfo ret_lsh, ret_rsh; ^~~~~~~ main.cpp:111:20: warning: 'ret_rsh' may be used uninitialized in this function [-Wmaybe-uninitialized] Tinfo ret_lsh, ret_rsh; ^~~~~~~ main.cpp: In member function 'Tinfo tree_decomposition::TreeDecomposition<Tinfo, Combiner>::query(int, int) [with Tinfo = int; Combiner = tree_decomposition::DefaultCombiner<int>]': main.cpp:334:11: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] Tinfo sol, ret; ^~~ main.cpp: In member function 'int tree_decomposition::TreeDecomposition<Tinfo, Combiner>::dfs(int) [with Tinfo = int; Combiner = tree_decomposition::DefaultCombiner<int>]': main.cpp:276:14: warning: 'chosen_son' may be used uninitialized in this function [-Wmaybe-uninitialized] path_[what_path_[chosen_son]].array_.push_back(node); ~~~~~^