Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:19:9: warning: unused variable ‘i’ [-Wunused-variable] int i, nod; ^ user.cpp:19:12: warning: unused variable ‘nod’ [-Wunused-variable] int i, nod; ^ user.cpp: In function ‘void solve()’: user.cpp:49:9: warning: unused variable ‘i’ [-Wunused-variable] int i, j; ^ user.cpp:49:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘void read()’: user.cpp:103:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &d, &c, &v); ^ user.cpp:107:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp: In function ‘int main()’: user.cpp:115:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^