one unfinished

CSES - CSES Problem Set/Traffic_Lights.cpp

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+//
+// Created by darian on 07.06.24.
+//
+
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+int main() {
+    ll x; cin >> x;
+    int n; cin >> n;
+    map<ll, int> distances;
+    distances[x] = 1;
+    set<pair<ll, ll>> lines = {{0, x}};
+
+    for (int i{}; i < n; i++) {
+        ll t; cin >> t;
+        auto it = lines.lower_bound({t, t});
+        --it;
+        auto p = *it;
+        lines.erase(p);
+        lines.insert({p.first, t});
+        lines.insert({t, p.second});
+        if (distances[p.second - p.first] == 1) distances.erase(p.second - p.first);
+        distances[t - p.first]++;
+        distances[p.second - t]++;
+        cout << (*distances.rbegin()).first << endl;
+    }
+
+}