Compilare: user.cpp: In function ‘void slv()’: user.cpp:47:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); UF::I(m*2); ^ user.cpp:51:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int a, b, t; scanf("%d%d%d", &a, &b, &t); ^ user.cpp: In function ‘int main()’: user.cpp:95:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ulei.in", "r", stdin); ^ user.cpp:96:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("ulei.out", "w", stdout); ^ user.cpp:97:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int t; scanf("%d", &t); ^