Eroare de compilare: user.cpp: In function ‘__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > > find(int)’: user.cpp:20: error: conversion from ‘int’ to non-scalar type ‘__gnu_cxx::__normal_iterator<int*, std::vector<int, std::allocator<int> > >’ requested user.cpp: In function ‘int insert(int)’: user.cpp:26: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:45: error: no match for ‘operator!=’ in ‘find((((((((- a1) * x1) * x1) * x1) - (((a2 * x2) * x2) * x2)) - (((a3 * x2) * x2) * x2)) + 18750000)) != 0’ user.cpp:46: error: ‘sol’ was not declared in this scope user.cpp:50: error: ‘sol’ was not declared in this scope