Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:33:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[node].size(); ++i) ~^~~~~~~~~~~~~~~ main.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[node].size(); ++i) ~^~~~~~~~~~~~~~~ main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i+1<v[node].size()) others = others * q[i+1] % Mod; ~~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("karb2.in", "r", stdin); ^ main.cpp:71:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("karb2.out", "w", stdout); ^