From 80d695997af501fb6cc486199983c698bf6df85d Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Thu, 15 Oct 2020 19:54:14 +0800
Subject: [PATCH] =?UTF-8?q?P1102=20A-B=20=E6=95=B0=E5=AF=B9?=
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R39856779
---
 problem/P1102/P1102.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 problem/P1102/P1102.cpp

diff --git a/problem/P1102/P1102.cpp b/problem/P1102/P1102.cpp
new file mode 100644
index 00000000..b7d973fc
--- /dev/null
+++ b/problem/P1102/P1102.cpp
@@ -0,0 +1,19 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long     n, c, ans = 0;
+    int           a[200005];
+    map<int, int> b;
+    cin >> n >> c;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+        b[a[i]]++;
+    }
+    for (int i = 1; i <= n; i++) {
+        ans += b[a[i] + c];
+    }
+    cout << ans << endl;
+    return 0;
+}