Compilare: main.cpp: In function 'int dfs(int)': main.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: At global scope: main.cpp:26:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:28:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(input, "r", stdin); ^ main.cpp:29:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen(output, "w", stdout); ^