Compilare: main.cpp: In function 'int dfz(int, int)': main.cpp:14:13: warning: unused variable 'ret' [-Wunused-variable] int ret = 0; ^~~ main.cpp: In function 'int dfs(int, int, int)': main.cpp:64:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:71:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("walk.in", "r", stdin); ^ main.cpp:72:45: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("plimbare.out", "w", stdout); ^