diff --git a/ZOJ/3938_csdn.cpp b/ZOJ/3938_csdn.cpp
new file mode 100644
index 0000000..c2e9989
--- /dev/null
+++ b/ZOJ/3938_csdn.cpp
@@ -0,0 +1,49 @@
+#include <bits/stdc++.h>
+using namespace std;
+typedef pair<int, int> PII;
+
+vector<PII> res;
+int b[5][5], a[5];
+
+int main() {
+  int T; scanf("%d", &T);
+  for (int cas = 1; cas <= T; ++cas) {
+    int r[5];
+    for (int i = 0; i < 5; ++i) {
+      for (int j = 0; j < 5; ++j) {
+        cin >> b[i][j];
+      }
+    }
+    // stage 1
+    int *x = b[0], d = x[0];
+    if (d <= 2) r[0] = 2;
+    else r[0] = d;
+    // stage 2
+    x = b[1], d = x[0];
+    for (int i = 1; i < 5; ++i) a[x[i]] = i;
+    if (d == 1) r[1] = a[4];
+    else if (d == 3) r[1] = 1;
+    else r[1] = r[0];
+    // stage 3
+    x = b[2], d = x[0];
+    for (int i = 1; i < 5; ++i) a[x[i]] = i;
+    if (d == 1) r[2] = a[b[1][r[1]]];
+    else if (d == 2) r[2] = a[b[0][r[0]]];
+    else if (d == 4) r[2] = a[4];
+    else r[2] = d;
+    // stage 4
+    x = b[3], d = x[0];
+    if (d == 1) r[3] = r[0];
+    else if (d == 2) r[3] = 1;
+    else r[3] = r[1];
+    // stage 5
+    x = b[4], d = x[0];
+    for (int i = 1; i < 5; ++i) a[x[i]] = i;
+    if (d <= 2) r[4] = a[b[d - 1][r[d - 1]]];
+    else r[4] = a[b[6 - d][r[6 - d]]];
+    for (int i = 0; i < 5; ++i) {
+      cout << r[i] << " " << b[i][r[i]] << endl;
+    }
+  }
+  return 0;
+}