'commit'

TangDou/AoSaiYiBenTong/YBT1035.cpp

@@ -0,0 +1,12 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    //cin读入优化
+    std::ios::sync_with_stdio(false);
+    int a1, a2, n;
+    cin >> a1 >> a2 >> n;
+    cout << a1 + (a2 - a1) * (n - 1) << endl;
+    return 0;
+}