QOJ.ac

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
#577401#1835. Fancy FormulasWorld_CreaterWA 76ms3688kbC++17894b2024-09-20 11:09:302024-09-20 11:09:30

Judging History

你现在查看的是最新测评结果

  • [2024-09-20 11:09:30]
  • 评测
  • 测评结果:WA
  • 用时:76ms
  • 内存:3688kb
  • [2024-09-20 11:09:30]
  • 提交

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";
	}
}

详细

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'