Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void Euler(int, int)’: user.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); ++i) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:106:15: warning: iteration 200001 invokes undefined behavior [-Waggressive-loop-optimizations] pw[i] = (pw[i-1] * base) % mod; ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:105:22: note: within this loop for(int i = 1; i <= SD; ++i) ^ user.cpp:103:15: warning: iteration 200000 invokes undefined behavior [-Waggressive-loop-optimizations] pp[i] = pp[i/2] + 1; ~~~~~~^~~~~~~~~~~~~ user.cpp:102:22: note: within this loop for(int i = 2; i <= SD; ++i) ^