delete pics to save space

2.10570.cpp

@@ -0,0 +1,62 @@
+#include<stdio.h>
+#include<string.h>
+#define MAXD 510
+#define INF 0x3fffffff
+int a[MAXD], ans[MAXD], g[MAXD], min, N;
+int exchange()
+{
+    int i, j, k, cnt = 0;
+    for(i = 1; i <= N; i ++)
+        if(ans[i] != i)
+        {
+            g[ans[i]] = g[i];
+            ans[g[i]] = ans[i];
+            cnt ++;
+        }
+    return cnt;
+}
+void solve()
+{
+    int i, j, k, start, cnt;
+    for(i = 1; i <= N; i ++)
+        scanf("%d", &a[i]);
+    min = INF;
+    for(start = 1; start <= N; start ++)
+    {
+        for(i = 1, j = start; i <= N; i ++, j ++)
+        {
+            if(j > N)
+                j = 1;
+            ans[i] = a[j];
+            g[a[j]] = i;
+        }
+        cnt = exchange();
+        if(cnt < min)
+            min = cnt;
+    }
+    for(start = 1; start <= N; start ++)
+    {
+        for(i = 1, j = start; i <= N; i ++, j --)
+        {
+            if(j == 0)
+                j = N;
+            ans[i] = a[j];
+            g[a[j]] = i;
+        }
+        cnt = exchange();
+        if(cnt < min)
+            min = cnt;
+    }
+    printf("%d\n", min);
+}
+int main()
+{
+    while(1)
+    {
+        scanf("%d", &N);
+        if(!N)
+            break;
+        solve();
+    }
+    return 0;
+}