Compilare: user.cpp: In function ‘int main()’: user.cpp:116:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fantasy.in", "r", stdin); ^ user.cpp:117:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fantasy.out", "w", stdout); ^ user.cpp: In function ‘void dfs(int, int)’: user.cpp:26:48: warning: iteration 14u invokes undefined behavior [-Waggressive-loop-optimizations] dp[i][node] = dp[i - 1][dp[i - 1][node]]; ^ user.cpp:25:5: note: containing loop for (int i = 1; i <= 17; ++ i) ^