P7667 [JOI2018] Art Exhibition

R52303722

Luogu/problem/P7667/P7667.cpp

@@ -0,0 +1,30 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+struct node {
+    long long a, b;
+
+    bool operator<(const node& b) {
+        return a < b.a;
+    }
+} a[500005];
+int n;
+long long s[500005], c, ans;
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i].a >> a[i].b;
+    }
+    sort(a + 1, a + 1 + n);
+    for (int i = 1; i <= n; i++) {
+        s[i] = s[i - 1] + a[i].b;
+    }
+    for (int i = 0; i <= n; i++) {
+        c = max(c, a[i].a - s[i - 1]);
+        ans = max(ans, s[i] - a[i].a + c);
+    }
+    cout << ans << endl;
+    return 0;
+}