P4168 [Violet]蒲公英

https://www.luogu.com.cn/record/76005637

Luogu/P4168/P4168.cpp

@@ -0,0 +1,53 @@
+#include <algorithm>
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+const int N = 1e5 + 5;
+
+int n, m, a[N], b[N];
+std::vector<int> nums;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n >> m;
+
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+        nums.push_back(a[i]);
+    }
+
+    std::sort(nums.begin(), nums.end());
+    nums.erase(std::unique(nums.begin(), nums.end()), nums.end());
+    for (int i = 1; i <= n; i++) {
+        a[i] = std::lower_bound(nums.begin(), nums.end(), a[i]) - nums.begin();
+    }
+
+    for (int i = 1, l, r, x = 0; i <= m; i++) {
+        memset(b, 0x00, sizeof(b));
+
+        std::pair<int, int> ans;
+
+        cin >> l >> r;
+        l = (l + x - 1) % n + 1;
+        r = (r + x - 1) % n + 1;
+        if (l > r) std::swap(l, r);
+
+        for (int i = l; i <= r; i++) b[a[i]]++;
+
+        for (int i = 0; i < nums.size(); i++) {
+            if (b[i] > ans.first) {
+                ans = std::make_pair(b[i], i);
+            }
+        }
+
+        cout << (x = nums[ans.second]) << endl;
+    }
+
+    return 0;
+}