delete pics to save space

7.1061.cpp

@@ -0,0 +1,23 @@
+#include<cstdio>
+#include<algorithm>
+using namespace std;
+typedef long long LL;
+LL x,y,m,n,L,t,r,d;
+LL exgcd(LL a,LL b,LL &x,LL &y)
+{
+	if(b==0) { x=1; y=0; return a; }
+	LL d=exgcd(b,a%b,y,x);
+	y-=x*(a/b);
+	return d;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%lld%lld%lld%lld%lld",&x,&y,&m,&n,&L);
+	d=exgcd(m-n,L,t,r);
+	if((y-x)%d) puts("Impossible");
+	else printf("%lld\n",((y-x)/d*t%L+L)%L);
+	return 0;
+}