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QOJ
| ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
|---|---|---|---|---|---|---|---|---|---|
| #228337 | #7642. Integer Half-Sum | ucup-team266# | AC ✓ | 1ms | 3576kb | C++14 | 1.0kb | 2023-10-28 13:21:50 | 2023-10-28 13:21:51 |
Judging History
answer
/*
Things to notice:
1. do not calculate useless values
2. do not use similar names
Things to check:
1. submit the correct file
2. time (it is log^2 or log)
3. memory
4. prove your naive thoughts
5. long long
6. corner case like n=0,1,inf or n=m
7. check if there is a mistake in the ds or other tools you use
8. fileio in some oi-contest
9. module on time
10. the number of a same divisor in a math problem
11. multi-information and queries for dp and ds problems
*/
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pii pair<long long,long long>
#define mp make_pair
#define pb push_back
const int mod=998244353;
const int inf=0x3f3f3f3f;
const int INF=1e18;
void solve()
{
int l,r;
cin>>l>>r;
if(l==r)
{
cout<<l<<"\n";
return;
}
if(l+1==r)
{
cout<<"-1\n";
return;
}
cout<<r-1<<"\n";
}
signed main()
{
// ios::sync_with_stdio(0);
// cin.tie(0);
int _=1;
// cin>>_;
while(_--) solve();
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 3448kb
input:
2 4
output:
3
result:
ok 1 number(s): "3"
Test #2:
score: 0
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time: 0ms
memory: 3396kb
input:
1 1
output:
1
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ok 1 number(s): "1"
Test #3:
score: 0
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time: 0ms
memory: 3448kb
input:
1 2
output:
-1
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ok 1 number(s): "-1"
Test #4:
score: 0
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time: 0ms
memory: 3388kb
input:
100 100
output:
100
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ok 1 number(s): "100"
Test #5:
score: 0
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time: 1ms
memory: 3356kb
input:
99 100
output:
-1
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ok 1 number(s): "-1"
Test #6:
score: 0
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time: 0ms
memory: 3364kb
input:
3 3
output:
3
result:
ok 1 number(s): "3"
Test #7:
score: 0
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time: 0ms
memory: 3576kb
input:
2 3
output:
-1
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ok 1 number(s): "-1"
Test #8:
score: 0
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time: 0ms
memory: 3564kb
input:
1 3
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2
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ok 1 number(s): "2"
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score: 0
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time: 0ms
memory: 3360kb
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4
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ok 1 number(s): "4"
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time: 1ms
memory: 3452kb
input:
3 7
output:
6
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ok 1 number(s): "6"
Test #11:
score: 0
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time: 1ms
memory: 3448kb
input:
3 8
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7
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ok 1 number(s): "7"
Test #12:
score: 0
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time: 0ms
memory: 3356kb
input:
4 10
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9
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ok 1 number(s): "9"
Test #13:
score: 0
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time: 1ms
memory: 3568kb
input:
35 37
output:
36
result:
ok 1 number(s): "36"
Test #14:
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time: 1ms
memory: 3564kb
input:
43 46
output:
45
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ok 1 number(s): "45"
Test #15:
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time: 0ms
memory: 3280kb
input:
82 86
output:
85
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ok 1 number(s): "85"
Test #16:
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time: 0ms
memory: 3408kb
input:
55 60
output:
59
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ok 1 number(s): "59"
Test #17:
score: 0
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time: 0ms
memory: 3412kb
input:
25 31
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30
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Test #18:
score: 0
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time: 0ms
memory: 3408kb
input:
37 44
output:
43
result:
ok 1 number(s): "43"
Test #19:
score: 0
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time: 1ms
memory: 3404kb
input:
75 83
output:
82
result:
ok 1 number(s): "82"
Test #20:
score: 0
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time: 0ms
memory: 3576kb
input:
74 83
output:
82
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ok 1 number(s): "82"
Test #21:
score: 0
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time: 0ms
memory: 3392kb
input:
88 98
output:
97
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ok 1 number(s): "97"
Test #22:
score: 0
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time: 1ms
memory: 3368kb
input:
75 86
output:
85
result:
ok 1 number(s): "85"
Test #23:
score: 0
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time: 0ms
memory: 3404kb
input:
1 100
output:
99
result:
ok 1 number(s): "99"
Test #24:
score: 0
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time: 0ms
memory: 3404kb
input:
1 50
output:
49
result:
ok 1 number(s): "49"
Test #25:
score: 0
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time: 0ms
memory: 3400kb
input:
50 100
output:
99
result:
ok 1 number(s): "99"
Test #26:
score: 0
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time: 0ms
memory: 3568kb
input:
7 35
output:
34
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ok 1 number(s): "34"
Test #27:
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time: 0ms
memory: 3532kb
input:
87 95
output:
94
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Test #28:
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time: 0ms
memory: 3524kb
input:
11 30
output:
29
result:
ok 1 number(s): "29"
Test #29:
score: 0
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time: 1ms
memory: 3568kb
input:
47 69
output:
68
result:
ok 1 number(s): "68"
Test #30:
score: 0
Accepted
time: 1ms
memory: 3412kb
input:
11 48
output:
47
result:
ok 1 number(s): "47"
Test #31:
score: 0
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time: 0ms
memory: 3404kb
input:
71 85
output:
84
result:
ok 1 number(s): "84"
Test #32:
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time: 0ms
memory: 3392kb
input:
84 89
output:
88
result:
ok 1 number(s): "88"
Test #33:
score: 0
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time: 0ms
memory: 3356kb
input:
22 56
output:
55
result:
ok 1 number(s): "55"
Test #34:
score: 0
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time: 0ms
memory: 3412kb
input:
2 72
output:
71
result:
ok 1 number(s): "71"
Test #35:
score: 0
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time: 0ms
memory: 3356kb
input:
18 55
output:
54
result:
ok 1 number(s): "54"
Test #36:
score: 0
Accepted
time: 1ms
memory: 3404kb
input:
4 11
output:
10
result:
ok 1 number(s): "10"
Test #37:
score: 0
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time: 0ms
memory: 3408kb
input:
42 59
output:
58
result:
ok 1 number(s): "58"
Test #38:
score: 0
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time: 0ms
memory: 3280kb
input:
52 79
output:
78
result:
ok 1 number(s): "78"
Test #39:
score: 0
Accepted
time: 1ms
memory: 3408kb
input:
11 48
output:
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ok 1 number(s): "47"
Test #40:
score: 0
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time: 0ms
memory: 3280kb
input:
4 51
output:
50
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ok 1 number(s): "50"
Test #41:
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time: 0ms
memory: 3408kb
input:
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Test #42:
score: 0
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time: 0ms
memory: 3360kb
input:
21 88
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result:
ok 1 number(s): "87"
Test #43:
score: 0
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time: 0ms
memory: 3352kb
input:
17 94
output:
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result:
ok 1 number(s): "93"
Test #44:
score: 0
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time: 1ms
memory: 3408kb
input:
11 98
output:
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result:
ok 1 number(s): "97"
Test #45:
score: 0
Accepted
time: 0ms
memory: 3336kb
input:
2 99
output:
98
result:
ok 1 number(s): "98"
Extra Test:
score: 0
Extra Test Passed