lanqiao 2098 刷题统计(数学优化)

13lanqiao/test3-2.cpp

@@ -0,0 +1,24 @@
+// lanqiao 2098 刷题统计(数学优化)
+#include<bits/stdc++.h>
+using namespace std;
+#define int long long
+signed main(){
+    int a, b, n; cin >> a >> b >> n;
+    int d = 5 * a + 2 * b;
+    if(n % d == 0) cout << (n/d)*7 << endl;
+    else{
+        int r = n % d, sum = 0;
+        for(int i = 1; i <= 7; i++){
+            if(i <= 5) sum += a;
+            else sum += b;
+            if(sum >= r){
+                cout << (n/d)*7 + i << endl;
+                return 0;
+            }
+        }
+    }
+    return 0;
+}
+/* test samples -> 8
+10 20 99
+*/