Compilare: main.cpp: In function 'int dfs(int, int, int)': main.cpp:49:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:68:13: warning: unused variable 'mxx' [-Wunused-variable] int mxx = 0 ; ^~~ main.cpp:54:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.in" , "r" , stdin) ; ^ main.cpp:55:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("kdtree.out" , "w" , stdout) ; ^