Compilare: user.cpp: In function ‘int DFS(int)’: user.cpp:15:25: warning: variable ‘X3’ set but not used [-Wunused-but-set-variable] int X1 = 0, X2 = 0, X3 = 0, minVal1 = INF, minVal2 = INF, minVal3 = INF; ^ user.cpp: In function ‘int main()’: user.cpp:68:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("northrend.in", "r", stdin); ^ user.cpp:69:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("northrend.out", "w", stdout); ^ user.cpp:71:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &N, &X); ^ user.cpp:75:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &c); ^