diff --git a/40.cpp b/40.cpp
index 6b0336b..7836cfa 100644
--- a/40.cpp
+++ b/40.cpp
@@ -4,10 +4,6 @@ using namespace std;
 struct node
 {
     int w, s;
-    const bool operator<(const node &x) const
-    {
-        return w + s < x.w + x.s;
-    }
 } a[50005];
 int main()
 {
@@ -15,7 +11,8 @@ int main()
     scanf("%d", &n);
     for (int i = 1; i <= n; ++i)
         scanf("%d%d", &a[i].w, &a[i].s);
-    sort(a + 1, a + 1 + n);
+    sort(a + 1, a + 1 + n, [](node x, node y)
+         { return x.w + x.s < y.w + y.s; });
     int tot = 0, ans = -2147483648;
     for (int i = 1; i <= n; ++i)
     {