Compilare: user.cpp: In function ‘void read()’: user.cpp:21:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, z; ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:49:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^ user.cpp:50:21: warning: unused variable ‘y’ [-Wunused-variable] int p = lst[x], y; ^ user.cpp: In function ‘void read()’: user.cpp:22:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.in", "r", stdin); ^ user.cpp:23:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &q); ^ user.cpp:27:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &z); ^ user.cpp: In function ‘void write()’: user.cpp:88:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac.out", "w", stdout); ^ user.cpp:89:55: 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); ^