new file: B3627.cpp

B3627.cpp

@@ -0,0 +1,18 @@
+#include<bits/stdc++.h>
+using namespace std;
+long long n;
+int main(){
+    scanf("%lld",&n);
+    long double l=1,r=n,mid=(l+r)/2;
+    while(r-l>=1e-6){
+        mid=(l+r)/2;
+        if(mid*mid*mid<n){
+            l=mid;
+        }else{
+            r=mid;
+        }
+    }
+    long long ans = mid;
+    printf("%lld\n",ans);
+    return 0;
+}