Compilare: user.cpp: In function ‘int main()’: user.cpp:84:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < keep.size(); ++ j) ^ user.cpp:88:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < keep.size(); ++ j) { ^ user.cpp:57:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echipe.in", "r", stdin); ^ user.cpp:58:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("echipe.out", "w", stdout); ^ user.cpp:63:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp: In member function ‘void PLAYER::read()’: user.cpp:12:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^