new file: P2512.cpp

P2512.cpp

@@ -0,0 +1,20 @@
+#include <bits/stdc++.h>
+#define int long long
+using namespace std;
+int a[1000005], c[1000005];
+signed main()
+{
+    int n, v = 0, sum = 0;
+    scanf("%lld", &n);
+    for (int i = 1; i <= n; ++i)
+        scanf("%lld", &a[i]), sum += a[i];
+    v = sum / n;
+    for (int i = 1; i <= n; i++)
+        c[i] = c[i - 1] + a[i] - v;
+    sort(c + 1, c + 1 + n);
+    int ans = 0, mi = c[(n + 1) / 2];
+    for (int i = 1; i <= n; i++)
+        ans += abs(mi - c[i]);
+    printf("%lld\n", ans);
+    return 0;
+}