Potential bug in PotentializedOfflineDynamicConnectivity

[HyunjaeLee]

toggle_edge receives weight w also in edge deletion.

void toggle_edge(int u, int v, A w)

If user set w as a dummy value or a garbage value it occurs a logical flaw.

for (auto i = 0; i < E; ++i) {
    auto [u, v, l, w] = edges_[i];
    auto r = k;
    if (i + 1 < E && u == std::get<0>(edges_[i + 1]) && v == std::get<1>(edges_[i + 1])) {
        r = std::get<2>(edges_[++i]);
    }
    l += k;
    r += k;
    while (l < r) {
        if (l & 1) {
            segment[l++].emplace_back(i);
        }
        if (r & 1) {
            segment[--r].emplace_back(i);
        }
        l >>= 1;
        r >>= 1;
    }
}

Because if there was an edge removal, i points to the removal event not the insertion event.