Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:57:76: warning: operation on ‘sumStv[0]’ may be undefined [-Wsequence-point] sumCnt[ ++sumCnt[0] ] = sumCnt[ sumCnt[0]-1] + withoutNode[ node ];//, ^ user.cpp:57:76: warning: operation on ‘sumCnt[0]’ may be undefined [-Wsequence-point] user.cpp: In function ‘void next()’: user.cpp:22:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(S, 1, CIFMAX, stdin); poz = 0; ^ user.cpp: In function ‘int main()’: user.cpp:82:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tractomarm.in", "r", stdin); ^ user.cpp:83:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tractomarm.out", "w", stdout); ^