Compilare: user.cpp: In function ‘void read()’: user.cpp:88:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < eul.size(); ++i) ^ user.cpp:91:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; (1 << j) <= eul.size(); ++j) { ^ user.cpp:92:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + (1 << j) - 1 < eul.size(); ++i) { ^ user.cpp:62:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.in", "r", stdin); ^ user.cpp:63:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("concurs.out", "w", stdout); ^ user.cpp:65:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:71:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &points[i]); ^ user.cpp:74:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:98:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:84:21: warning: ‘father’ may be used uninitialized in this function [-Wmaybe-uninitialized] euler(father, 0); ^