From 5038906317401294df2971f05c549c9314243920 Mon Sep 17 00:00:00 2001
From: Bruno Freitas Tissei <bft15@inf.ufpr.br>
Date: Wed, 25 Apr 2018 14:49:22 +0200
Subject: [PATCH] Add BALE11
Signed-off-by: Bruno Freitas Tissei <bft15@inf.ufpr.br>
---
contests/Cadernaveis/BALE11.cpp | 54 +++++++++++++++++++++++++++++++++
1 file changed, 54 insertions(+)
create mode 100644 contests/Cadernaveis/BALE11.cpp
diff --git a/contests/Cadernaveis/BALE11.cpp b/contests/Cadernaveis/BALE11.cpp
new file mode 100644
index 0000000..16e26aa
--- /dev/null
+++ b/contests/Cadernaveis/BALE11.cpp
@@ -0,0 +1,54 @@
+#include <bits/stdc++.h>
+
+#define MAX 101010
+#define MOD 1000000007
+#define inf 0x3f3f3f3f
+
+#define fi first
+#define se second
+#define sz size()
+#define pb push_back
+#define all(x) (x).begin(), (x).end()
+#define rall(x) (x).rbegin(), (x).rend()
+
+using namespace std;
+
+typedef long long ll;
+typedef pair<int,int> ii;
+
+int v[MAX];
+int tree[MAX];
+
+int query(int idx) {
+ int sum = 0;
+ for (; idx > 0; idx -= (idx & -idx))
+ sum += tree[idx];
+
+ return sum;
+}
+
+
+void update(int idx, int val) {
+ for (; idx <= MAX; idx += (idx & -idx))
+ tree[idx] += val;
+}
+
+
+int main() {
+ ios::sync_with_stdio(0);
+ cin.tie(0);
+
+ int n;
+ cin >> n;
+ for (int i = 0; i < n; ++i)
+ cin >> v[i];
+
+ int ans = 0;
+ for (int i = 0; i < n; ++i) {
+ ans += query(n - v[i] + 1);
+ update(n - v[i] + 1, 1);
+ }
+
+ cout << ans << '\n';
+ return 0;
+}
--
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