#13356. 「NOIP2022模拟赛1119」rev

http://www.nfls.com.cn:10611/submission/242774

NFLSOJ/13356/13356.cpp

@@ -0,0 +1,63 @@
+#include <iostream>
+#include <algorithm>
+#include <fstream>
+#include <string>
+#include <utility>
+#include <vector>
+
+// using std::cin;
+// using std::cout;
+std::ifstream cin("rev.in");
+std::ofstream cout("rev.out");
+const char endl = '\n';
+
+std::string s, t;
+std::vector<std::pair<int, int>> ans;
+
+bool check() {
+    if (std::count(s.begin(), s.end(), '1') != std::count(t.begin(), t.end(), '1')) {
+        return false;
+    }
+
+    for (int i = 0; i < s.size(); i++) {
+        if (s[i] == t[i]) continue;
+
+        int cnt = 0;
+        bool flag = false;
+
+        for (int j = i; j < s.size(); j++) {
+            if (s[j] == '1') cnt++;
+
+            if (s[j] == t[i] && cnt % 2 == 0) {
+                flag = true;
+                ans.emplace_back(i + 1, j + 1);
+                std::reverse(s.begin() + i, s.begin() + j + 1);
+                break;
+            }
+        }
+
+        if (!flag) return false;
+    }
+
+    return true;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> s >> t;
+
+    if (check()) {
+        cout << "YES" << endl
+             << ans.size() << endl;
+
+        for (auto e : ans) {
+            cout << e.first << ' ' << e.second << endl;
+        }
+    } else {
+        cout << "NO" << endl;
+    }
+
+    return 0;
+}