Compilare: user.cpp: In function ‘int main()’: user.cpp:29:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y; ^ user.cpp:29:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y; ^ user.cpp:29:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y; ^ user.cpp:29:27: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y; ^ user.cpp:29:30: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, s, t, d, k, x, y; ^ user.cpp: In function ‘void computeLCA(int, int)’: user.cpp:104:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ nod ].size(); ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:26:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in","r",stdin); ^ user.cpp:27:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out","w",stdout); ^ user.cpp:31:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:33:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^ user.cpp:43:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^