Compilare: user.cpp: In function ‘int main()’: user.cpp:126:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("smen.in", "r", stdin); ^ user.cpp:127:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("smen.out", "w", stdout); ^ user.cpp:129:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &k, &a, &b); ^ user.cpp:132:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i].val); ^ user.cpp: In function ‘void traseu()’: user.cpp:111:20: warning: ‘iff’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (iff > x && jf) { ^ user.cpp:115:37: warning: ‘tf’ may be used uninitialized in this function [-Wmaybe-uninitialized] sol[v[iff].ind] = tf; ^ user.cpp:111:24: warning: ‘jf’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (iff > x && jf) { ^