Compilare: user.cpp: In function ‘void solve()’: user.cpp:66:18: warning: unused variable ‘x’ [-Wunused-variable] int i, root, x, y; ^ user.cpp:66:21: warning: unused variable ‘y’ [-Wunused-variable] int i, root, x, y; ^ user.cpp:67:8: warning: unused variable ‘maxx’ [-Wunused-variable] LL maxx = -INF; ^ user.cpp: In function ‘void read()’: user.cpp:29:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:31:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^ user.cpp:34:31: 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:88:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp: In function ‘void solve()’: user.cpp:74:14: warning: ‘root’ may be used uninitialized in this function [-Wmaybe-uninitialized] DFS(root); ^