Submission #153397

#	Time	Username	Problem	Language	Result	Execution time	Memory
153397		mhy908	Art Exhibition (JOI18_art)	C++14	100 / 100	396 ms	41292 KiB

art

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define llinf 987654321987654321
using namespace std;
typedef long long LL;
typedef pair<int, int> pii;
typedef pair<LL, LL> pll;
struct SEGMENT_TREE {
    struct NODE {
        int st, fin;
        LL maxx;
    } tree[3000000];
    int x=0;
    void maketree(int point, int num) {
        if(num==1) {
            x++;
            tree[point].st=tree[point].fin=x;
        }
        if(num<=1)return;
        maketree(point*2, num-num/2);
        maketree(point*2+1, num/2);
        tree[point].st=tree[point*2].st;
        tree[point].fin=tree[point*2+1].fin;
    }
    LL maxrange(int a, int b, int point) {
        if(tree[point].st>=a&&tree[point].fin<=b)return tree[point].maxx;
        if(tree[point].st>b||tree[point].fin<a)return -llinf;
        return max(maxrange(a, b, point*2), maxrange(a, b, point*2+1));
    }
    void updaterange(int point, int num, LL p) {
        if(tree[point].st==tree[point].fin) {
            tree[point].maxx=p;
            return;
        }
        if(num<=tree[point*2].fin)updaterange(point*2, num, p);
        else updaterange(point*2+1, num, p);
        tree[point].maxx=max(tree[point*2].maxx, tree[point*2+1].maxx);
    }
    void init(int n) {
        maketree(1, n);
    }
    LL get_max(int a, int b) {
        return maxrange(a, b, 1);
    }
    void update(int a, LL num) {
        updaterange(1, a, num);
    }
}seg;
int n;
pll arr[500010];
LL sum[500010], ans;
int main()
{
    scanf("%d", &n);
    seg.init(n);
    for(int i=1; i<=n; i++){
        scanf("%lld %lld", &arr[i].F, &arr[i].S);
    }
    sort(arr+1, arr+n+1);
    for(int i=1; i<=n; i++)
        sum[i]=sum[i-1]+arr[i].S;
    for(int i=1; i<=n; i++)
        seg.update(i, sum[i]-arr[i].F);
    for(int i=1; i<=n; i++)
        ans=max(ans, seg.get_max(i, n)+arr[i].F-sum[i-1]);
    printf("%lld", ans);
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:56:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
art.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld %lld", &arr[i].F, &arr[i].S);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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