delete pics to save space

7.3045.cpp

@@ -0,0 +1,25 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+const int maxn=50005;
+struct COW { int w,s; };
+int n; COW co[maxn];
+inline bool operator<(const COW &a,const COW &b) { return a.w+a.s<b.w+b.s; }
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	for(int i=0;i<n;i++) scanf("%d%d",&co[i].w,&co[i].s);
+	sort(co,co+n);
+	LL sum=0,res=-1e9;
+	for(int i=0;i<n;i++)
+	{
+		if(sum-co[i].s>res) res=sum-co[i].s;
+		sum+=co[i].w;
+	}
+	printf("%lld\n",res);
+	return 0;
+}