QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #187021 | #3857. Single-track railway | CometoTraval# | AC ✓ | 78ms | 12356kb | C++14 | 1.3kb | 2023-09-24 13:57:05 | 2023-09-24 13:57:05 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll tree[4000010];
int a[1000010];
void build(int l,int r,int t)
{
if (l==r)
{
tree[t] = a[l];
return;
}
int mid=(l+r)>>1;
build(l,mid,t<<1);
build(mid+1,r,t<<1|1);
tree[t] = tree[t<<1] + tree[t<<1|1];
}
ll query(int l,int r,int t,ll s)
{
if (l==r)
{
s+=a[l];
ll ans1 = 2*s-tree[1];
ll ans2 = tree[1]-2*(s-a[l]);
//printf("%d %lld\n",l,s);
return min(ans1,ans2);
}
int mid=(l+r)>>1;
if (2*(s+tree[t<<1]) > tree[1] ) return query(l,mid,t<<1,s);
return query(mid+1,r,t<<1|1,s+tree[t<<1]);
}
void modify(int l,int r,int t,int p,int key)
{
if (l==r)
{
tree[t]=key;
return;
}
int mid=(l+r)>>1;
if (p<=mid) modify(l,mid,t<<1,p,key);
else modify(mid+1,r,t<<1|1,p,key);
tree[t]=tree[t<<1]+tree[t<<1|1];
}
int main()
{
int n;
scanf("%d",&n);
for (int i=2;i<=n;i++) scanf("%d",&a[i]);
build(2,n,1);
int q;
scanf("%d",&q);
printf("%lld\n",query(2,n,1,0));
while (q--)
{
int x,y;
scanf("%d%d",&x,&y);
modify(2,n,1,x+1,y);
a[x+1]=y;
printf("%lld\n",query(2,n,1,0));
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 5668kb
input:
2 39 7 1 20 1 70 1 56 1 37 1 37 1 37 1 91
output:
39 20 70 56 37 37 37 91
result:
ok 8 lines
Test #2:
score: 0
Accepted
time: 0ms
memory: 5724kb
input:
3 8 41 0
output:
33
result:
ok single line: '33'
Test #3:
score: 0
Accepted
time: 1ms
memory: 5668kb
input:
30 86 100 80 30 23 17 90 98 20 3 43 31 49 14 14 47 13 44 7 30 50 29 67 68 56 69 28 61 81 10 21 23 7 99 16 70 3 50 4 17 26 42 7 37 10 43 26 83 13 96
output:
8 19 28 5 3 10 11 17 5 18 1
result:
ok 11 lines
Test #4:
score: 0
Accepted
time: 0ms
memory: 5660kb
input:
150 7 76 71 86 28 49 57 12 30 79 91 52 27 49 5 30 2 27 31 49 69 73 57 53 57 6 94 35 30 16 51 71 50 82 34 31 65 2 63 91 20 89 92 11 39 88 36 40 26 16 46 20 87 89 74 43 99 39 55 60 82 27 52 83 20 95 22 16 1 51 64 79 53 59 88 13 94 64 73 47 67 77 24 9 59 49 70 77 49 3 62 24 16 70 10 95 78 16 75 64 44 4...
output:
1 18 44 63 61 60 23 41 35 1 18 21 45 56 85 79 70 58 91 69 81 77 55 49 7 20 5 1 49 67 84 84 69 67 88 25 44 78 69 30 32 38 15 77 66 37 34 5 44 20 28 57 18 80 9 8 7 10 79 10 85 81 20 11 8 15 80 64 83 83 58 61 18 33 48 5 6 29 69 12 51 19 6 19 37 26 4 16 74 40 73 71 74 67 56 52 35 77 66 76 34 37 85 57 57...
result:
ok 501 lines
Test #5:
score: 0
Accepted
time: 2ms
memory: 5784kb
input:
5000 11 95 41 4 70 9 85 27 53 63 58 34 55 56 38 100 51 37 9 30 40 79 58 44 9 62 30 89 34 28 48 7 39 41 37 15 34 3 76 8 13 28 92 25 51 97 68 29 53 29 48 59 85 70 84 71 59 89 32 77 25 1 16 5 75 95 48 98 41 25 17 65 11 12 16 48 11 26 67 82 40 61 41 7 9 11 30 15 70 62 72 82 1 85 15 60 55 3 97 72 33 56 5...
output:
25 6 10 42 2 5 17 9 35 22 27 33 36 1 21 10 12 13 34 79 39 39 67 20 5 26 54 59 73 46 53 100 56 100 89 82 67 94 95 72 74 25 12 6 31 63 71 84 52 60 67 71 65 6 28 41 26 30 42 18 4 26 32 7 17 22 22 20 3 14 7 20 30 37 41 27 41 85 36 85 76 62 34 50 41 27 76 73 91 67 79 31 23 92 68 87 63 85 64 46 23 22 4 79...
result:
ok 4001 lines
Test #6:
score: 0
Accepted
time: 4ms
memory: 5752kb
input:
10000 62 38 17 45 76 67 23 23 77 13 62 7 85 90 67 66 68 62 80 6 89 4 64 88 38 38 55 75 17 24 7 25 12 98 75 27 39 55 25 45 98 4 82 57 48 46 22 62 89 37 98 94 61 45 80 11 84 28 44 30 96 24 65 46 58 66 25 83 96 35 65 41 99 60 10 79 94 33 6 64 52 95 72 85 90 82 41 75 68 36 5 23 67 79 5 94 43 31 4 60 56 ...
output:
23 24 34 28 14 66 52 12 29 28 64 58 7 0 6 20 28 27 26 36 68 54 43 13 55 5 1 16 2 31 10 5 7 1 19 73 68 57 69 65 34 40 39 68 7 11 8 0 17 6 3 20 23 29 18 8 70 22 21 20 31 23 67 17 20 7 35 63 52 61 55 66 13 12 53 66 27 85 52 22 3 30 22 8 6 23 80 40 4 4 20 76 87 87 18 43 61 13 23 35 49 21 40 50 17 60 29 ...
result:
ok 30001 lines
Test #7:
score: 0
Accepted
time: 22ms
memory: 7852kb
input:
50000 54 92 38 60 53 71 8 36 15 95 40 23 65 9 26 90 66 78 49 32 100 14 51 74 31 87 4 55 56 45 98 71 67 90 19 11 58 74 24 58 11 21 69 10 77 8 21 53 65 10 92 62 32 92 47 53 92 24 39 7 82 90 57 88 22 53 95 53 20 18 97 100 5 28 37 5 81 63 49 32 39 90 94 38 67 56 79 25 56 21 95 35 11 39 65 71 66 69 46 68...
output:
39 53 25 79 64 33 26 7 15 44 74 46 21 52 33 22 38 13 33 5 80 67 53 65 41 45 80 80 66 21 27 30 6 2 34 65 55 88 24 54 70 80 53 47 13 9 74 26 25 2 4 7 58 50 68 59 71 84 74 73 52 9 3 24 8 3 4 31 49 79 5 2 34 48 70 79 60 46 3 6 39 71 78 0 85 29 45 22 53 31 6 9 40 21 8 9 43 33 83 80 24 21 0 56 74 62 47 33...
result:
ok 70001 lines
Test #8:
score: 0
Accepted
time: 36ms
memory: 8104kb
input:
100000 64 84 86 63 34 72 80 67 19 76 61 36 10 33 21 8 48 83 52 30 12 56 40 54 7 42 43 9 9 51 92 56 13 23 96 8 89 7 42 83 37 38 33 66 56 53 13 17 32 48 60 24 8 19 56 36 54 81 88 75 28 18 19 62 96 69 10 49 22 17 51 21 81 24 65 7 49 65 99 19 5 50 5 81 29 9 26 27 8 86 57 24 12 33 21 36 81 93 97 62 1 43 ...
output:
28 8 24 69 27 7 49 9 5 14 2 47 37 19 6 48 53 77 60 46 4 33 86 56 49 20 40 26 88 77 46 69 72 47 76 25 34 58 43 51 53 45 51 63 66 2 67 45 26 32 35 29 29 52 27 20 33 44 25 18 65 65 3 8 69 46 39 48 63 21 22 30 90 25 84 54 48 47 26 43 82 60 71 71 29 27 12 22 31 3 36 49 84 64 3 28 40 68 76 30 24 44 81 89 ...
result:
ok 120001 lines
Test #9:
score: 0
Accepted
time: 45ms
memory: 10440kb
input:
160000 19 10 84 78 78 100 91 27 83 53 1 84 63 27 69 22 83 98 75 38 6 57 22 23 84 51 55 11 87 34 58 57 45 89 24 47 25 41 66 77 14 82 13 48 78 79 41 6 49 18 90 76 27 90 39 37 79 48 69 11 78 34 1 26 14 47 51 19 81 76 70 77 97 77 45 74 18 27 10 79 23 64 32 61 88 56 1 85 53 49 13 62 16 43 80 48 59 58 43 ...
output:
13 15 30 8 6 8 0 15 23 4 23 21 38 27 32 24 2 3 13 14 4 27 17 31 8 23 7 9 12 40 15 26 16 35 13 26 52 49 42 41 36 39 36 13 69 4 29 6 24 8 29 43 7 20 2 54 34 55 18 37 4 25 63 50 14 4 29 55 16 2 5 14 2 50 38 18 48 22 46 38 38 12 39 23 35 20 13 27 44 39 19 12 3 37 44 51 7 13 0 13 37 25 27 40 22 35 34 23 ...
result:
ok 150001 lines
Test #10:
score: 0
Accepted
time: 68ms
memory: 10484kb
input:
200000 8 34 100 26 32 83 90 49 78 76 31 64 23 43 92 94 92 50 82 21 34 38 43 4 22 89 76 55 27 70 77 59 26 4 83 44 21 10 64 8 50 19 92 99 22 19 42 52 86 79 67 73 3 13 30 11 75 80 76 19 24 59 79 25 22 93 1 78 93 70 53 80 27 13 18 28 76 86 57 86 46 10 7 72 46 43 53 22 77 4 14 35 37 4 3 9 38 79 10 8 93 3...
output:
42 33 34 2 16 25 43 3 19 19 10 2 30 23 36 46 6 2 25 13 6 9 13 30 46 31 63 51 65 2 67 55 82 34 19 34 43 19 42 43 60 36 12 19 27 46 33 52 60 67 29 55 63 6 32 24 35 43 17 48 25 23 33 12 46 30 37 38 51 28 40 33 29 46 67 31 92 99 88 47 7 19 72 0 18 70 37 34 30 2 17 19 53 55 50 39 26 18 46 45 18 6 3 0 7 2...
result:
ok 200001 lines
Test #11:
score: 0
Accepted
time: 41ms
memory: 12356kb
input:
200000 1000000 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...
output:
800002 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 800002 1 80000...
result:
ok 200001 lines
Test #12:
score: 0
Accepted
time: 42ms
memory: 10780kb
input:
200000 999996 7 4 6 3 2 1 6 6 1 10 7 5 5 2 9 6 4 7 3 1 2 5 7 1 7 7 5 10 3 1 9 7 9 8 8 7 1 5 7 8 1 3 4 3 2 2 2 10 1 2 8 6 6 8 4 6 2 7 3 8 5 1 6 7 10 4 3 3 10 10 4 6 8 3 2 3 4 10 3 3 5 4 1 8 2 10 1 4 5 5 3 10 2 5 7 1 3 5 10 8 9 1 6 8 3 9 3 8 8 2 9 2 4 9 5 7 5 1 5 7 6 5 7 3 7 7 2 9 7 9 5 10 10 5 2 6 10...
output:
1 899643 3 1 4 899634 1 5 1 899640 1 7 1 899639 3 7 3 899638 5 6 5 899647 1 6 3 899640 0 7 2 899640 2 1 0 899638 2 0 3 899643 4 2 5 899640 4 5 2 899638 2 3 3 899640 4 7 0 899640 2 3 4 899645 1 8 3 899639 4 8 0 899643 4 4 5 899644 2 5 1 899634 1 4 5 899644 3 5 1 899647 1 4 3 899640 4 0 4 899634 4 7 3...
result:
ok 200001 lines
Test #13:
score: 0
Accepted
time: 78ms
memory: 10524kb
input:
200000 317938 219927 155685 111489 565924 604299 621658 687792 227393 452425 613272 701003 712740 588319 229660 882320 302465 489853 300038 19286 299173 705819 212476 744039 59678 959435 329118 701295 977974 817966 654854 243464 187401 132055 737139 802038 835052 966075 159950 22148 348823 252056 39...
output:
602290 730793 676088 56201 402016 598334 595042 778368 432336 381848 739186 580081 346934 700485 26164 485196 416174 335923 395099 241899 218118 630573 468395 499200 510076 241935 375392 174881 726742 655764 324768 296 777343 566627 203423 4949 686589 372460 804437 604888 542902 26884 449687 451596 ...
result:
ok 200001 lines