oj.uz

답안 #593392

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
593392 2022-07-11T03:15:21 Z haojiandan 3단 점프 (JOI19_jumps) C++14
46 / 100
 395 ms 125052 KB 
// wygzgyw
#include <bits/stdc++.h>
using namespace std;
template <typename T> void read(T &t) {
	t=0; char ch=getchar(); int f=1;
	while (ch<'0'||ch>'9') { if (ch=='-') f=-1; ch=getchar(); }
	do { (t*=10)+=ch-'0'; ch=getchar(); } while ('0'<=ch&&ch<='9'); t*=f;
}
template <typename T> void write(T t) {
	if (t<0) { putchar('-'); write(-t); return; }
	if (t>9) write(t/10);
	putchar('0'+t%10);
}
template <typename T> void writeln(T t) { write(t); puts(""); }
#define MP make_pair
typedef long long ll;
const int maxn=(5e5)+10;
int n,a[maxn];
int q;
int st[maxn][20],lg[maxn];
int query(int x,int y) {
	assert(1<=x&&x<=y&&y<=n);
	int j=lg[y-x+1];
	return max(st[x][j],st[y-(1<<j)+1][j]);
}
namespace BF {
ll mx[5010][5010];
void solve() {
	for (int len=1;len<=n;len++)
	for (int i=1,j=len;j<=n;i++,j++) {
		mx[i][j]=max(mx[i+1][j],mx[i][j-1]);
		int l=i+1,r=(i+j)>>1;
		if (l<=r) mx[i][j]=max(mx[i][j],(ll)a[i]+a[j]+query(l,r));
	}
	read(q);
	while (q--) {
		int x,y; read(x),read(y);
		printf("%lld\n",mx[x][y]);
	}
	exit(0);
}
};
namespace Q1 {
ll ans;
pair<int,int> b[maxn];
void chkmax(ll &x,ll y) { if (x<y) x=y; }
void solve() {
	for (int i=1;i<=n;i++) b[i]=MP(a[i],i);
	sort(b+1,b+n+1),reverse(b+1,b+n+1);
	for (int i=1;i<=n&&i<=50;i++) {
		int x=b[i].second;
		int l,r;
		for (int y=x+1;y<=n;y++) {
			l=y*2-x,r=n;
			if (l<=r) chkmax(ans,(ll)a[x]+a[y]+query(l,r));
		}
		for (int y=1;y<x;y++) {
			l=x*2-y,r=n;
			if (l<=r) chkmax(ans,(ll)a[x]+a[y]+query(l,r));
		}
		for (int y=1;y<x;y++) {
			l=max(1,y*2-x),r=y-1;
			if (l<=r) chkmax(ans,(ll)a[x]+a[y]+query(l,r));
		}
	}
	printf("%lld\n",ans);
}
};
int main() {
	//freopen("1.txt","r",stdin);
	read(n);
	for (int i=1;i<=n;i++) read(a[i]),st[i][0]=a[i];
	for (int i=2;i<=n;i++) lg[i]=lg[i>>1]+1;
	for (int i=1;i<=19;i++) for (int j=1;j+(1<<i)-1<=n;j++)
		st[j][i]=max(st[j][i-1],st[j+(1<<(i-1))][i-1]);
	if (n<=5000) BF::solve();
	Q1::solve();
	return 0;
}
/*
  0. Enough array size? Enough array size? Enough array size? Integer overflow?
  
  1. Think TWICE, Code ONCE!
  Are there any counterexamples to your algo?
    
  2. Be careful about the BOUNDARIES!
  N=1? P=1? Something about 0?
    
  3. Do not make STUPID MISTAKES!
  Time complexity? Memory usage? Precision error?
*/

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 696 KB Output is correct
6 Correct 1 ms 696 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 696 KB Output is correct
6 Correct 1 ms 696 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 395 ms 125004 KB Output is correct
12 Correct 359 ms 124956 KB Output is correct
13 Correct 324 ms 124920 KB Output is correct
14 Correct 325 ms 125032 KB Output is correct
15 Correct 376 ms 125052 KB Output is correct
16 Correct 351 ms 124364 KB Output is correct
17 Correct 330 ms 124364 KB Output is correct
18 Correct 395 ms 124476 KB Output is correct
19 Correct 331 ms 124916 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 129 ms 20812 KB Output is correct
2 Correct 120 ms 20804 KB Output is correct
3 Correct 98 ms 20732 KB Output is correct
4 Correct 134 ms 20872 KB Output is correct
5 Correct 127 ms 20756 KB Output is correct
6 Correct 129 ms 20172 KB Output is correct
7 Correct 133 ms 20068 KB Output is correct
8 Correct 138 ms 20192 KB Output is correct
9 Correct 129 ms 20428 KB Output is correct

Subtask #4
0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 724 KB Output is correct
3 Correct 1 ms 724 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 1 ms 696 KB Output is correct
6 Correct 1 ms 696 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 395 ms 125004 KB Output is correct
12 Correct 359 ms 124956 KB Output is correct
13 Correct 324 ms 124920 KB Output is correct
14 Correct 325 ms 125032 KB Output is correct
15 Correct 376 ms 125052 KB Output is correct
16 Correct 351 ms 124364 KB Output is correct
17 Correct 330 ms 124364 KB Output is correct
18 Correct 395 ms 124476 KB Output is correct
19 Correct 331 ms 124916 KB Output is correct
20 Correct 129 ms 20812 KB Output is correct
21 Correct 120 ms 20804 KB Output is correct
22 Correct 98 ms 20732 KB Output is correct
23 Correct 134 ms 20872 KB Output is correct
24 Correct 127 ms 20756 KB Output is correct
25 Correct 129 ms 20172 KB Output is correct
26 Correct 133 ms 20068 KB Output is correct
27 Correct 138 ms 20192 KB Output is correct
28 Correct 129 ms 20428 KB Output is correct
29 Incorrect 341 ms 51856 KB Output isn't correct
30 Halted 0 ms 0 KB -