#3110. 「SDOI2019」快速查询

https://loj.ac/s/1603421

LibreOJ/3110/3110.cpp

@@ -0,0 +1,97 @@
+#include <iostream>
+#include <unordered_map>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int Q = 1e5 + 5;
+const int mod = 1e7 + 19;
+
+int n, q, t, inv[mod], add, mul = 1, sum, ans;
+std::tuple<int, int, int> ops[Q];
+std::unordered_map<int, int> map;
+
+int get(int x) {
+    return (static_cast<long long>(map.count(x) ? map[x] : 0) * mul + add) % mod;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    inv[1] = 1;
+    for (int i = 2; i < mod; i++) {
+        inv[i] = static_cast<long long>(mod - mod / i) * inv[mod % i] % mod;
+    }
+
+    cin >> n >> q;
+
+    for (int i = 1, x, v; i <= q; i++) {
+        cin >> x;
+
+        std::get<0>(ops[i]) = x;
+
+        if (x == 1) {
+            cin >> std::get<1>(ops[i]) >> v;
+
+            std::get<2>(ops[i]) = (v % mod + mod) % mod;
+        } else if (x <= 5) {
+            cin >> v;
+
+            std::get<1>(ops[i]) = (v % mod + mod) % mod;
+        }
+
+        if (x == 3 && std::get<1>(ops[i]) == 0) {
+            std::get<0>(ops[i]) = 4;
+        }
+    }
+
+    cin >> t;
+
+    for (int i = 1, a, b; i <= t; i++) {
+        cin >> a >> b;
+
+        for (int j = 1; j <= q; j++) {
+            int id = (a + static_cast<long long>(j) * b) % q + 1;
+            int op = std::get<0>(ops[id]);
+
+            if (op == 1) {
+                int index = std::get<1>(ops[id]),
+                    value = std::get<2>(ops[id]);
+
+                sum = ((sum - get(index)) % mod + mod) % mod;
+                map[index] = (static_cast<long long>(value - add) * inv[mul] % mod + mod) % mod;
+                sum = ((sum + value) % mod + mod) % mod;
+            } else if (op == 2) {
+                int value = std::get<1>(ops[id]);
+
+                add = ((add + value) % mod + mod) % mod;
+                sum = ((sum + static_cast<long long>(value) * n % mod) % mod + mod) % mod;
+            } else if (op == 3) {
+                int value = std::get<1>(ops[id]);
+
+                mul = (static_cast<long long>(mul) * value % mod + mod) % mod;
+                add = (static_cast<long long>(add) * value % mod + mod) % mod;
+                sum = (static_cast<long long>(sum) * value % mod + mod) % mod;
+            } else if (op == 4) {
+                int value = std::get<1>(ops[id]);
+
+                mul = 1;
+                add = value;
+                sum = (static_cast<long long>(value) * n % mod + mod) % mod;
+                map.clear();
+            } else if (op == 5) {
+                int index = std::get<1>(ops[id]);
+
+                ans = ((ans + get(index)) % mod + mod) % mod;
+            } else {  // op == 6
+                ans = ((ans + sum) % mod + mod) % mod;
+            }
+        }
+    }
+
+    cout << (ans % mod + mod) % mod << endl;
+
+    return 0;
+}