Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:73:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[x].size(); ++ i) ^ user.cpp: In function ‘int LCA(int, int)’: user.cpp:86:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, z = INF; ^ user.cpp: In function ‘void solution()’: user.cpp:115:27: warning: unused variable ‘lca’ [-Wunused-variable] int x, y, A, B, C, D, lca, i; ^ user.cpp: In function ‘void read()’: user.cpp:43:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &p); ^ user.cpp:46:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &c); ^ user.cpp: In function ‘void solution()’: user.cpp:122:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d %d %d", &x, &y, &A, &B, &C, &D); ^