Compilare: user.cpp: In function ‘void dfs2(int)’: user.cpp:43:17: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int fiu, d, c, sum = 0; ^ user.cpp:43:20: warning: unused variable ‘sum’ [-Wunused-variable] int fiu, d, c, sum = 0; ^ user.cpp: In function ‘int main()’: user.cpp:63:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arb2.in", "r", stdin); ^ user.cpp:64:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("arb2.out", "w", stdout); ^ user.cpp:66:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:70:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d%d%d", &x, &y, &d, &c); ^