HDOJ: 7459

游走

HDOJ/7459.cpp

@@ -0,0 +1,89 @@
+/**
+ * @file 7459.cpp
+ * @author Macesuted (i@macesuted.moe)
+ * @date 2024-07-27
+ *
+ * @copyright Copyright (c) 2024
+ *
+ */
+
+#include <bits/stdc++.h>
+using namespace std;
+
+#ifndef LOCAL
+#define endl '\n'
+#endif
+
+bool mem1;
+
+typedef pair<int, int> pii;
+
+int tl, tr;
+bool flag;
+
+map<int, int> S;
+
+void check(pii a, pii b) {
+    if (((a.first + a.second) & 1) ^ ((b.first + b.second) & 1)) tl = max(tl, a.first + 1);
+    if (a.second == 1 && b.second > 1) tr = min(tr, b.first - b.second + 1);
+    if (abs(a.second - b.second) > b.first - a.first) flag = false;
+    return;
+}
+
+void insert(int tim, int pos) {
+    if (S.count(tim) && S[tim] != pos) return flag = false, void();
+    S[tim] = pos;
+    auto p = S.find(tim);
+    if (p != S.begin()) check(*--p, {tim, pos});
+    p = S.find(tim);
+    if (++p != S.end()) check({tim, pos}, *p);
+    return;
+}
+
+void solve(void) {
+    int n, m;
+    cin >> n >> m;
+    tl = 0, tr = 1 << 30, flag = true;
+    S.clear(), insert(0, 1);
+    while (m--) {
+        int op;
+        cin >> op;
+        if (op == 0) {
+            int p, q;
+            cin >> p >> q;
+            if (tl > tr || !flag) continue;
+            insert(q, p);
+        } else if (op == 1) {
+            if (tl > tr || !flag)
+                cout << "bad" << endl;
+            else
+                cout << tl << endl;
+        } else {
+            if (tl > tr || !flag)
+                cout << "bad" << endl;
+            else if (tr == (1 << 30))
+                cout << "inf" << endl;
+            else
+                cout << tr << endl;
+        }
+    }
+    return;
+}
+
+bool mem2;
+
+int main() {
+    ios::sync_with_stdio(false), cin.tie(nullptr);
+#ifdef LOCAL
+    cerr << "Memory Cost: " << abs(&mem1 - &mem2) / 1024. / 1024. << "MB" << endl;
+#endif
+
+    int _ = 1;
+    cin >> _;
+    while (_--) solve();
+
+#ifdef LOCAL
+    cerr << "Time Cost: " << clock() * 1000. / CLOCKS_PER_SEC << "MS" << endl;
+#endif
+    return 0;
+}