Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:72:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < E[x].size(); ++ i) ^ user.cpp: In function ‘void write()’: user.cpp:169:13: warning: unused variable ‘lca’ [-Wunused-variable] int lca = LCA(x, y); ^ user.cpp: In function ‘void read()’: user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radiatie.in", "r", stdin); ^ user.cpp:40:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &k); ^ user.cpp:43:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &el.x, &el.y, &el.z); ^ user.cpp: In function ‘void write()’: user.cpp:163:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radiatie.out", "w", stdout); ^ user.cpp:166:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^