Submission #225456

#	Time	Username	Problem	Language	Result	Execution time	Memory
225456		Nightlight	Art Exhibition (JOI18_art)	C++14	100 / 100	295 ms	21112 KiB

art

#include <bits/stdc++.h>
#define pii pair<long long, long long>
#define a first
#define b second
using namespace std;

int N;
pii A[500005];
long long ans, best = -1e9;
//pre[i] - pre[j - 1] - (A[i] - A[j])
//pre[i] - A[i] + (A[j] - pre[j - 1])

int main() {
//  freopen("inp", "r", stdin);
  scanf("%d", &N);
  for(int i = 1; i <= N; i++) {
    scanf("%lld %lld", &A[i].a, &A[i].b);
  }
  sort(A + 1, A + N + 1);
  for(int i = 1; i <= N; i++) {
    A[i].b += A[i - 1].b;
    best = max(best, A[i].a - A[i - 1].b);
    ans = max(ans, A[i].b - A[i].a + best);
  }
  printf("%lld\n", ans);
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:15:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &N);
   ~~~~~^~~~~~~~~~
art.cpp:17:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld %lld", &A[i].a, &A[i].b);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50