QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#577401 | #1835. Fancy Formulas | World_Creater | WA | 76ms | 3688kb | C++17 | 894b | 2024-09-20 11:09:30 | 2024-09-20 11:09:30 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
int qpow(int a,int b,int mod)
{
if(b==0) return 1;
int g=qpow(a,b/2,mod);
g=1ll*g*g%mod;
if(b&1) g=1ll*g*a%mod;
return g;
}
int p,q;
typedef long long ll;
int main()
{
cin>>p>>q;
while(q--)
{
int a,b,c,d;
cin>>a>>b>>c>>d;
if((a+b)%p!=(c+d)%p)
{
cout<<"-1\n";
continue ;
}
int s=qpow((a+b)%p,p-2,p);
a=1ll*a*s%p;
c=1ll*c*s%p;
int ans=0;
// cerr<<"???"<<a<<" "<<c<<"\n";
for(;;ans++)
{
ll wl=(a*(1ll<<ans))-(1ll<<ans)+1,wr=a*(1ll<<ans);
ll cc=c+p*((wl-c+p-1)/p);
// cerr<<wl<<" "<<cc<<" "<<wr<<"\n";
if(wl<=cc&&cc<=wr) break ;
// if(wr/p-wl/p>1) break ;
// if(wr/p==wl/p)
// {
// wl%=p,wr%=p;
// if(c>=wl&&c<=wr) break ;
// }
// else
// {
// wl%=p,wr%=p;
// if(c>=wl||c<=wr) break ;
// }
}
cout<<ans<<"\n";
}
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3688kb
input:
5 10 2 1 3 0 2 1 4 4 1 3 4 0 0 2 0 4 3 3 1 2 0 1 0 1 0 3 0 3 0 1 0 1 1 2 4 4 1 0 1 1
output:
2 1 2 -1 -1 0 0 0 1 -1
result:
ok 10 numbers
Test #2:
score: -100
Wrong Answer
time: 76ms
memory: 3616kb
input:
97 100000 30 56 74 12 95 39 8 29 11 42 76 74 48 63 58 53 74 22 85 11 80 23 84 4 30 90 30 90 92 91 41 45 21 82 11 92 65 30 28 67 74 57 95 36 16 31 78 66 2 77 6 73 83 20 41 62 45 44 92 94 96 28 77 47 76 12 87 1 47 80 42 85 46 91 65 72 23 39 4 58 21 96 37 80 83 33 66 50 84 21 61 44 4 78 47 35 39 50 39 ...
output:
6 6 5 6 6 -1 0 4 6 7 7 6 6 2 7 7 6 7 6 4 6 5 5 3 0 4 5 6 6 5 5 5 6 5 5 6 7 -1 5 4 -1 6 4 -1 4 6 5 5 -1 6 6 7 0 -1 2 -1 5 -1 5 7 2 4 6 4 6 6 -1 6 7 6 6 7 6 -1 4 2 7 0 6 -1 6 2 -1 4 6 5 -1 7 3 5 0 -1 7 3 4 6 4 6 0 1 5 7 6 -1 -1 -1 6 5 5 5 3 3 3 -1 -1 2 3 5 6 -1 -1 7 -1 5 7 6 5 6 -1 3 5 5 -1 4 5 6 -1 6...
result:
wrong answer 316th numbers differ - expected: '6', found: '8'