'commit'

TangDou/AcWing/BIT/SZSZ_Prepare_0.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+const int N = 110;
+int n;
+//树状数组模板
+int tr[N];
+#define lowbit(x) (x & -x)
+void add(int x, int c) {
+    for (int i = x; i <= n; i += lowbit(i)) tr[i] += c;
+}
+int sum(int x) {
+    int res = 0;
+    for (int i = x; i; i -= lowbit(i)) res += tr[i];
+    return res;
+}
+int main() {
+    n = 8;
+    for (int i = 1; i <= n; i++) add(i, 1);
+
+    for (int i = 1; i <= 8; i++) cout << tr[i] << endl;
+
+    // for (int i = 1; i <= 8; i++)
+    //     cout << sum(i) << endl;
+    return 0;
+}