Eroare de compilare: user.cpp:13:10: error: ‘long int y1’ redeclared as different kind of symbol long x1, y1, x2, y2; ^ In file included from /usr/include/features.h:346:0, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/os_defines.h:39, from /usr/local/include/c++/4.8.0/i686-pc-linux-gnu/bits/c++config.h:420, from /usr/local/include/c++/4.8.0/cstdio:41, from user.cpp:1: /usr/include/bits/mathcalls.h:242:1: error: previous declaration of ‘double y1(double)’ __MATHCALL (y1,, (_Mdouble_)); ^ user.cpp: In function ‘int main()’: user.cpp:35:52: warning: format ‘%ld’ expects argument of type ‘long int*’, but argument 3 has type ‘double (*)(double)throw ()’ [-Wformat=] scanf("%ld %ld %ld %ld", &x1, &y1, &x2, &y2); ^ user.cpp:36:18: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if(y1 == y2) { ^ user.cpp:41:19: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘long int’ [-fpermissive] tmp.p = y1; ^ user.cpp:44:21: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if(y1 > y2) ^ user.cpp:45:32: error: invalid operands of types ‘double(double)throw ()’ and ‘long int’ to binary ‘operator^’ y1 ^= y2 ^= y1 ^= y2; ^ user.cpp:45:32: error: in evaluation of ‘operator^=(double(double)throw (), long int)’ user.cpp:46:19: error: invalid conversion from ‘double (*)(double)throw ()’ to ‘long int’ [-fpermissive] tmp.a = y1; ^ user.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v.size(); i++) ^ user.cpp:55:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i + 1; j <= v.size(); j++) { ^ user.cpp:57:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < h.size(); k++) { ^