Compilare: main.cpp: In function 'void dfs(int)': main.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < a[x].size(); i++ ) { ~~^~~~~~~~~~~~~ main.cpp: In function 'char getch()': main.cpp:16:38: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread ( buff, 1, dim, stdin ); ^ main.cpp: In function 'int main()': main.cpp:61:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "ciclueuler.in", "r", stdin ); ^ main.cpp:62:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "ciclueuler.out", "w", stdout ); ^