Compilare: user.cpp: In function ‘int main()’: user.cpp:127:35: 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:128:37: 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:130:41: 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:133:31: 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:113:33: warning: ‘tf’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (re[iff-x][jf][tf] == 1) ^ user.cpp:113:33: warning: ‘jf’ may be used uninitialized in this function [-Wmaybe-uninitialized]