Eroare de compilare: user.cpp:8:15: error: ‘int y1’ redeclared as different kind of symbol int n,k,x1,x2,y1,y2,aux; ^ In file included from /usr/include/features.h:357:0, from /usr/include/stdio.h:28, from user.cpp:1: /usr/include/i386-linux-gnu/bits/mathcalls.h:243:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘void solve()’: user.cpp:21:41: warning: format ‘%d’ expects argument of type ‘int*’, but argument 3 has type ‘double (*)(double)throw ()’ [-Wformat=] scanf("%d%d%d%d",&x1,&y1,&x2,&y2); ^ In file included from /usr/include/c++/4.8/bits/stl_algobase.h:66:0, from /usr/include/c++/4.8/algorithm:61, from user.cpp:2: /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h: In instantiation of ‘void std::advance(_InputIterator&, _Distance) [with _InputIterator = std::_List_iterator<int>; _Distance = double (*)(double)throw ()]’: user.cpp:24:25: required from here /usr/include/c++/4.8/bits/stl_iterator_base_funcs.h:176:71: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘std::__iterator_traits<std::_List_iterator<int>, true>::difference_type {aka int}’ [-fpermissive] typename iterator_traits<_InputIterator>::difference_type __d = __n; ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:21:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&x1,&y1,&x2,&y2); ^ user.cpp: In function ‘int main()’: user.cpp:41:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.in","r",stdin); ^ user.cpp:42:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.out","w",stdout); ^