'commit'

GESP/Level5/Sample2.cpp

@@ -0,0 +1,47 @@
+#include <bits/stdc++.h>
+using namespace std;
+const int N = 510;
+string s[N];
+
+bool check(string x) {
+  for (int i = 1; i < x.size(); i++)
+    if (x[i] < x[i - 1])
+      return false;
+  return true;
+}
+int main() {
+  freopen("Sample.in", "r", stdin);
+
+  int T;
+  cin >> T;
+  while (T--) {
+    int n;
+    cin >> n;
+    int res = 1;
+    for (int i = 1; i <= n; i++) {
+      cin >> s[i];
+      if (!check(s[i]))
+        res = 0;
+    }
+    if (res == 0) {
+      cout << 0 << endl;
+      continue;
+    }
+    sort(s + 1, s + n + 1);
+
+    for (int i = 2; i <= n; i++) {
+      // 当前串的头
+      char head = s[i][0];
+      // 前一个串的尾巴
+      char tail = s[i - 1][s[i - 1].size() - 1];
+
+      if (head < tail) {
+        res = 0;
+        break;
+      }
+    }
+    cout << res << endl;
+  }
+
+  return 0;
+}