Eroare de compilare: main.cpp: In function 'lint check(lint)': main.cpp:74:11: error: found ':' in nested-name-specifier, expected '::' for(u : poly){ ^ main.cpp:74:9: error: 'u' is not a class, namespace, or enumeration for(u : poly){ ^ main.cpp:86:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses] u = poly.front(); ^ main.cpp:86:7: error: could not convert '(u = (*(const xy*)(& poly.std::vector<_Tp, _Alloc>::front<xy, std::allocator<xy> >())))' from 'xy' to 'bool' u = poly.front(); ~~^~~~~~~~~~~~~~ main.cpp:87:5: error: expected primary-expression before 'if' if(!(u.x == lu.x && u.y == lu.y)) ^~ main.cpp:87:5: error: expected ')' before 'if' Non zero exit status: 1