Compilare: user.cpp: In function ‘void solve()’: user.cpp:81:63: warning: operation on ‘ans[0]’ may be undefined [-Wsequence-point] ans[++ ans[0]] = ans[ans[0] - 1] + ans[ans[0] - 2]; ^ user.cpp:81:63: warning: operation on ‘ans[0]’ may be undefined [-Wsequence-point] user.cpp: In function ‘void read()’: user.cpp:15:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &t, &n, &k); ^ user.cpp:17:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^