Compilare: user.cpp: In function ‘void dfs()’: user.cpp:23:9: warning: unused variable ‘node1’ [-Wunused-variable] int node1 , node2; ^ user.cpp:23:17: warning: unused variable ‘node2’ [-Wunused-variable] int node1 , node2; ^ user.cpp: In function ‘int main()’: user.cpp:77:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("symmetricgraph2.in","r",stdin); ^ user.cpp:78:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("symmetricgraph2.out","w",stdout); ^ user.cpp:80:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:84:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^