Compilare: user.cpp: In constructor ‘line::line(std::vector<line>&)’: user.cpp:41:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < x[i].el.size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:205:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (L.size() >= kMaxL) { ^ user.cpp:211:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < L[i].el.size(); ++j) ^ user.cpp: In function ‘void solve()’: user.cpp:144:13: warning: ‘cDr’ may be used uninitialized in this function [-Wmaybe-uninitialized] target[cDr + 1] = n - 2; ^ user.cpp:137:21: warning: ‘cSt’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = cSt + 1; i < cDr; ++i) { ^