#10114. 「一本通 4.1 例 2」数星星 Stars

https://loj.ac/s/1025579

LibreOJ/10114/10114.cpp

@@ -0,0 +1,43 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, x, y, val[33000], ans[16000];
+
+struct node {
+    int x, y;
+} t[16000];
+
+int lowbit(int x) {
+    return x & (-x);
+}
+
+void add(int p, int v) {
+    while (p <= 32001) {
+        val[p] += v;
+        p += lowbit(p);
+    }
+}
+
+int sum(int p) {
+    int ans = 0;
+    while (p >= 1) {
+        ans += val[p];
+        p -= lowbit(p);
+    }
+    return ans;
+}
+
+int main() {
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        cin >> x >> y;
+        x++, y++;
+        ans[sum(x)]++;
+        add(x, 1);
+    }
+    for (int i = 0; i < n; i++) {
+        cout << ans[i] << endl;
+    }
+    return 0;
+}