'commit'

TangDou/LanQiaoBei/LanQiao12ShengSai/BC4_dfs_Prepare.cpp

@@ -0,0 +1,26 @@
+#include <bits/stdc++.h>
+
+// https://www.acwing.com/solution/content/34401/
+using namespace std;
+const int N = 20;
+int a[N];
+bool st[N];
+
+int n = 3;
+
+void dfs(int step) {
+    if (step == n + 1) {
+        for (int i = 1; i <= n; i++)printf("%d ", a[i]);
+        printf("\n");
+        return;
+    }
+    for (int i = 1; i <= n; i++) {
+            a[step] = i;
+            dfs(step + 1);
+    }
+}
+
+int main() {
+    dfs(1);
+    return 0;
+}