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FZOI/grouping.cpp

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+#include <bits/stdc++.h>
+#define int long long
+#define endl "\n"
+#define IMX LONG_LONG_MAX
+#define IMN LONG_LONG_MIN
+using namespace std;
+
+/* toothless. #17 */
+
+const int N = 1e7 + 10;
+const int M = 2e3 + 5;
+
+int n, mn = IMX;
+int a[N];
+
+signed main()
+{
+    cin >> n;
+    for (int i = 0; i < n; i ++ )
+    {
+        cin >> a[i];
+    }
+    sort(a, a + n);
+    int cnt = 1;
+    for (int i = 1; i < n; i ++ )
+    {
+        if (a[i] == a[i - 1] + 1)
+        {
+            cnt ++ ;
+        }
+        else
+        {
+            mn = min(mn, cnt);
+            cnt = 1;
+        }
+    }
+    mn = min(mn, cnt);
+    cout << mn << endl;
+    return 0;
+}