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QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #229438 | #7642. Integer Half-Sum | ucup-team2303# | AC ✓ | 12ms | 22452kb | C++14 | 1.4kb | 2023-10-28 16:10:23 | 2023-10-28 16:10:24 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const long long mod=1e9+7;
long long T,a,b,c,d[1000001],v[1000001],o,h[1000001],fa[1000001],q,w,e,an,cn,fac[1000001],inv[1000001],st[1000001],u[1000001];
char s[1000001];
struct p{long long q,w;}l[1000001];
long long pow_(long long qq,long long ww){long long ee=1;while(ww){if(ww&1) ee*=qq,ee%=mod;qq*=qq,qq%=mod,ww>>=1;}return ee%mod;}
inline int read(){int x=0,f=1;char c=getchar();while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}while(c>='0'&&c<='9'){x=(x<<3)+(x<<1)+c-'0';c=getchar();}return x*f;}
void add(long long qq,long long ww){l[++o].q=ww,l[o].w=h[qq],h[qq]=o;}
long long gcd(long long qq,long long ww){return !ww?qq:gcd(ww,qq%ww);}
long long find(long long qq){return qq==fa[qq]?qq:fa[qq]=find(fa[qq]);}
void merge(long long qq,long long ww){long long f1=find(qq),f2=find(ww);if(f1==f2) return;fa[f1]=f2;}
long long C(long long qq,long long ww){return fac[qq]*inv[ww]%mod*inv[qq-ww]%mod;}
int main()
{
// freopen("1.in","r",stdin);
srand((unsigned)(time(0)^(*new int)));
fac[0]=1;for(int i=1;i<=1000000;i++) fac[i]=fac[i-1]*i%mod;
inv[1000000]=pow_(fac[1000000],mod-2);for(int i=999999;i>=0;i--) inv[i]=inv[i+1]*(i+1)%mod;
T=1;
// scanf("%lld",&T);
for(int ii=1;ii<=T;ii++)
{
scanf("%lld%lld",&q,&w);
if(q==w)
{
printf("%lld",q);return 0;
}
if(w==q+1)
{
printf("-1");return 0;
}
printf("%lld",w-1);
}
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 12ms
memory: 22372kb
input:
2 4
output:
3
result:
ok 1 number(s): "3"
Test #2:
score: 0
Accepted
time: 7ms
memory: 22188kb
input:
1 1
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 11ms
memory: 20244kb
input:
1 2
output:
-1
result:
ok 1 number(s): "-1"
Test #4:
score: 0
Accepted
time: 11ms
memory: 20340kb
input:
100 100
output:
100
result:
ok 1 number(s): "100"
Test #5:
score: 0
Accepted
time: 0ms
memory: 20264kb
input:
99 100
output:
-1
result:
ok 1 number(s): "-1"
Test #6:
score: 0
Accepted
time: 12ms
memory: 22360kb
input:
3 3
output:
3
result:
ok 1 number(s): "3"
Test #7:
score: 0
Accepted
time: 11ms
memory: 20192kb
input:
2 3
output:
-1
result:
ok 1 number(s): "-1"
Test #8:
score: 0
Accepted
time: 12ms
memory: 22360kb
input:
1 3
output:
2
result:
ok 1 number(s): "2"
Test #9:
score: 0
Accepted
time: 11ms
memory: 22376kb
input:
2 5
output:
4
result:
ok 1 number(s): "4"
Test #10:
score: 0
Accepted
time: 3ms
memory: 20292kb
input:
3 7
output:
6
result:
ok 1 number(s): "6"
Test #11:
score: 0
Accepted
time: 12ms
memory: 22292kb
input:
3 8
output:
7
result:
ok 1 number(s): "7"
Test #12:
score: 0
Accepted
time: 7ms
memory: 22212kb
input:
4 10
output:
9
result:
ok 1 number(s): "9"
Test #13:
score: 0
Accepted
time: 11ms
memory: 20396kb
input:
35 37
output:
36
result:
ok 1 number(s): "36"
Test #14:
score: 0
Accepted
time: 11ms
memory: 22188kb
input:
43 46
output:
45
result:
ok 1 number(s): "45"
Test #15:
score: 0
Accepted
time: 11ms
memory: 20340kb
input:
82 86
output:
85
result:
ok 1 number(s): "85"
Test #16:
score: 0
Accepted
time: 11ms
memory: 22288kb
input:
55 60
output:
59
result:
ok 1 number(s): "59"
Test #17:
score: 0
Accepted
time: 7ms
memory: 22448kb
input:
25 31
output:
30
result:
ok 1 number(s): "30"
Test #18:
score: 0
Accepted
time: 3ms
memory: 22312kb
input:
37 44
output:
43
result:
ok 1 number(s): "43"
Test #19:
score: 0
Accepted
time: 10ms
memory: 20404kb
input:
75 83
output:
82
result:
ok 1 number(s): "82"
Test #20:
score: 0
Accepted
time: 10ms
memory: 20264kb
input:
74 83
output:
82
result:
ok 1 number(s): "82"
Test #21:
score: 0
Accepted
time: 11ms
memory: 22384kb
input:
88 98
output:
97
result:
ok 1 number(s): "97"
Test #22:
score: 0
Accepted
time: 11ms
memory: 22360kb
input:
75 86
output:
85
result:
ok 1 number(s): "85"
Test #23:
score: 0
Accepted
time: 10ms
memory: 22304kb
input:
1 100
output:
99
result:
ok 1 number(s): "99"
Test #24:
score: 0
Accepted
time: 11ms
memory: 22308kb
input:
1 50
output:
49
result:
ok 1 number(s): "49"
Test #25:
score: 0
Accepted
time: 11ms
memory: 20248kb
input:
50 100
output:
99
result:
ok 1 number(s): "99"
Test #26:
score: 0
Accepted
time: 7ms
memory: 20244kb
input:
7 35
output:
34
result:
ok 1 number(s): "34"
Test #27:
score: 0
Accepted
time: 11ms
memory: 20248kb
input:
87 95
output:
94
result:
ok 1 number(s): "94"
Test #28:
score: 0
Accepted
time: 10ms
memory: 20400kb
input:
11 30
output:
29
result:
ok 1 number(s): "29"
Test #29:
score: 0
Accepted
time: 11ms
memory: 22300kb
input:
47 69
output:
68
result:
ok 1 number(s): "68"
Test #30:
score: 0
Accepted
time: 11ms
memory: 20244kb
input:
11 48
output:
47
result:
ok 1 number(s): "47"
Test #31:
score: 0
Accepted
time: 11ms
memory: 20248kb
input:
71 85
output:
84
result:
ok 1 number(s): "84"
Test #32:
score: 0
Accepted
time: 3ms
memory: 22348kb
input:
84 89
output:
88
result:
ok 1 number(s): "88"
Test #33:
score: 0
Accepted
time: 11ms
memory: 20396kb
input:
22 56
output:
55
result:
ok 1 number(s): "55"
Test #34:
score: 0
Accepted
time: 10ms
memory: 20344kb
input:
2 72
output:
71
result:
ok 1 number(s): "71"
Test #35:
score: 0
Accepted
time: 5ms
memory: 22360kb
input:
18 55
output:
54
result:
ok 1 number(s): "54"
Test #36:
score: 0
Accepted
time: 11ms
memory: 22360kb
input:
4 11
output:
10
result:
ok 1 number(s): "10"
Test #37:
score: 0
Accepted
time: 7ms
memory: 20276kb
input:
42 59
output:
58
result:
ok 1 number(s): "58"
Test #38:
score: 0
Accepted
time: 7ms
memory: 22448kb
input:
52 79
output:
78
result:
ok 1 number(s): "78"
Test #39:
score: 0
Accepted
time: 7ms
memory: 20264kb
input:
11 48
output:
47
result:
ok 1 number(s): "47"
Test #40:
score: 0
Accepted
time: 11ms
memory: 22316kb
input:
4 51
output:
50
result:
ok 1 number(s): "50"
Test #41:
score: 0
Accepted
time: 11ms
memory: 22300kb
input:
3 60
output:
59
result:
ok 1 number(s): "59"
Test #42:
score: 0
Accepted
time: 11ms
memory: 22452kb
input:
21 88
output:
87
result:
ok 1 number(s): "87"
Test #43:
score: 0
Accepted
time: 11ms
memory: 22236kb
input:
17 94
output:
93
result:
ok 1 number(s): "93"
Test #44:
score: 0
Accepted
time: 0ms
memory: 22376kb
input:
11 98
output:
97
result:
ok 1 number(s): "97"
Test #45:
score: 0
Accepted
time: 0ms
memory: 20400kb
input:
2 99
output:
98
result:
ok 1 number(s): "98"
Extra Test:
score: 0
Extra Test Passed