Compilare: user.cpp: In function ‘void Read()’: user.cpp:28:18: warning: unused variable ‘cnt2’ [-Wunused-variable] int cnt = 1, cnt2 = 0; ^~~~ user.cpp:30:9: warning: unused variable ‘nb’ [-Wunused-variable] int nb = 0, x = 0, y = 0, c = 0; ^~ user.cpp: In function ‘void DFS(int)’: user.cpp:126:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[node].size(); i++) ~~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:261:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cuba.out", "w", stdout); ^