Eroare de compilare: user.cpp: In function ‘bool equal(double, double)’: user.cpp:18:14: error: call of overloaded ‘abs(double)’ is ambiguous if ( abs(a-b) < eps ) ^ user.cpp:18:14: note: candidates are: In file included from /usr/include/c++/4.8/cstdlib:72:0, from /usr/include/c++/4.8/bits/stl_algo.h:59, from /usr/include/c++/4.8/algorithm:62, from user.cpp:2: /usr/include/stdlib.h:771:12: note: int abs(int) extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur; ^ user.cpp:11:15: note: double abs(double) inline double abs ( double j ){ ^ In file included from /usr/include/c++/4.8/random:38:0, from /usr/include/c++/4.8/bits/stl_algo.h:65, from /usr/include/c++/4.8/algorithm:62, from user.cpp:2: /usr/include/c++/4.8/cmath:91:3: note: constexpr long double std::abs(long double) abs(long double __x) ^ /usr/include/c++/4.8/cmath:87:3: note: constexpr float std::abs(float) abs(float __x) ^ /usr/include/c++/4.8/cmath:81:3: note: constexpr double std::abs(double) abs(double __x) ^ In file included from /usr/include/c++/4.8/bits/stl_algo.h:59:0, from /usr/include/c++/4.8/algorithm:62, from user.cpp:2: /usr/include/c++/4.8/cstdlib:174:3: note: long long int std::abs(long long int) abs(long long __x) { return __builtin_llabs (__x); } ^ /usr/include/c++/4.8/cstdlib:166:3: note: long int std::abs(long int) abs(long __i) { return __builtin_labs(__i); } ^ user.cpp: In function ‘int main()’: user.cpp:78:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bujor.in", "r", stdin); ^ user.cpp:79:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bujor.out", "w", stdout); ^ user.cpp:82:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &tests); ^ user.cpp:84:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); m = n + n; ^