终于a了,这题还是比较麻烦的~wa的原因是没有考虑相除后是取它的上底还是下底。。。
#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
#include<queue>
#include<stack>
#include<string>
#include<map>
#include<set>
#include<cmath>
#include<cassert>
#include<cstring>
#include<iomanip>
using namespace std;
#ifdef _WIN32
#define i64 __int64
#define out64 "%I64d\n"
#define in64 "%I64d"
#else
#define i64 long long
#define out64 "%lld\n"
#define in64 "%lld"
#endif
#define FOR(i,a,b) for( int i = (a) ; i <= (b) ; i ++)
#define FF(i,a) for( int i = 0 ; i < (a) ; i ++)
#define FFD(i,a) for( int i = (a)-1 ; i >= 0 ; i --)
#define S64(a) scanf(in64,&a)
#define SS(a) scanf("%d",&a)
#define LL(a) ((a)<<1)
#define RR(a) (((a)<<1)+1)
#define SZ(a) ((int)a.size())
#define PP(n,m,a) puts("---");FF(i,n){FF(j,m)cout << a[i][j] << ' ';puts("");}
#define pb push_back
#define CL(Q) while(!Q.empty())Q.pop()
#define MM(name,what) memset(name,what,sizeof(name))
#define read freopen("in.txt","r",stdin)
#define write freopen("out.txt","w",stdout)
const int inf = 0x3f3f3f3f;
const i64 inf64 = 0x3f3f3f3f3f3f3f3fLL;
const double oo = 10e9;
const double eps = 10e-10;
const double pi = acos(-1.0);
i64 gcd(i64 _a, i64 _b)
{
if (!_a || !_b)
{
return max(_a, _b);
}
i64 _t;
while (_t = _a % _b)
{
_a = _b;
_b = _t;
}
return _b;
};
i64 ext_gcd (i64 _a, i64 _b, i64 &_x, i64 &_y)
{
if (!_b)
{
_x = 1;
_y = 0;
return _a;
}
i64 _d = ext_gcd (_b, _a % _b, _x, _y);
i64 _t = _x;
_x = _y;
_y = _t - _a / _b * _y;
return _d;
}
i64 exmod (i64 _a, i64 _p)
{
i64 _ans, _y;
ext_gcd (_a, _p, _ans, _y);
_ans < 0 ? _ans += _p : 0;
return _ans;
}
i64 a,b,c,x1,x2,y11,y22;
i64 gab;
i64 x,y;
i64 ans;
i64 findx(i64 q1,i64 q2,i64 w1,i64 w2)
{
if(q1>q2)
{
swap(q1,q2);
}
if(w1>w2)
{
swap(w1,w2);
}
if(q1 > w2 || q2 < w1)
{
return 0;
}
else if(q1<=w1 && w2<=q2)
{
return w2-w1+1;
}
else if(q1>=w1 &&q1<=w2)
{
if(q2<=w2)
{
return q2-q1+1;
}
else
{
return w2 - q1+1;
}
}
else if(q2>=w1 && q2 <= w2)
{
if(q1>=w1)
{
return q2 - q1 +1;
}
else
{
return q2 - w1 + 1;
}
}
}
int main()
{
i64 temp;
while(cin>>a>>b>>c)
{
cin>>x1>>x2;
cin>>y11>>y22;
if(a==0 && b==0)
{
if(c==0)
{
temp = (x2-x1+1)*(y22-y11+1);
cout<<temp<<endl;
continue;
}
else
{
cout<<"0"<<endl;
continue;
}
}
else if(a==0)
{
if(c%b==0)
{
temp = -c/b;
if(temp<=y22 && temp >= y11)
{
temp = x2-x1+1;
cout<<temp<<endl;
continue;
}
}
else
{
cout<<"0"<<endl;
continue;
}
}
else if(b==0)
{
if(c%a==0)
{
temp = -c/a;
if(temp <= x2 && temp >= x1)
{
temp = y22 - y11 +1;
cout<<temp<<endl;
continue;
}
}
else
{
cout<<"0"<<endl;
continue;
}
}
else
{
i64 t1,t2;
if(c>0)
{
c =- c;
a = -a;
b = -b;
}
c = -c;
if(a<0)
{
a = -a;
x1=-x1;
x2=-x2;
if(x1>x2)
swap(x1,x2);
}
if(b<0)
{
b=-b;
y11=-y11;
y22=-y22;
if(y11>y22)
swap(y11,y22);
}
gab = gcd(a,b);
a /= gab;
b /= gab;
if(c%gab!=0)
{
cout<<"0"<<endl;
continue;
}
x = exmod(a,b);
x *= c;
x %= b;
y = (c-a*x)/b;
i64 lix,rix;
i64 liy,riy;
lix = (x1-x)/b;
if(x1-x > 0 && (x1-x)%b!=0 )
{
lix ++;
}
rix = (x2-x)/b;
if(x2-x<0 && (x2-x)%b!=0)
{
rix--;
}
liy = (y-y22)/a;
if( y - y22 >0 && (y-y22)%a!=0)
{
liy++;
}
riy = (y-y11)/a;
if(y-y11<0 && (y-y11)%a != 0 )
{
riy--;
}
cout<<findx(lix,rix,liy,riy)<<endl;
}
}
return 0;
}