#1546. 【2022 正睿 NOIP 十连测 Day3】难

https://sjzezoj.com/submission/62736

S2OJ/1546/1546.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <numeric>
+#include <string>
+#include <unordered_map>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    std::string a, b;
+    std::unordered_map<char, int> map;
+
+    cin >> a >> b;
+
+    for (char c : b) map[c]++;
+
+    cout << (a.size() + 1) * (b.size() + 1) - std::accumulate(a.begin(), a.end(), 0ll, [&](long long lhs, char rhs) -> long long { return lhs + map[rhs]; }) << endl;
+
+    return 0;
+}