Mail.Ru Cup 2018 Round 2 C. Lucky Days（扩展欧几里得）
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#includeusing namespace std;typedef long long ll;int main(){ ll l1,r1,t1,l2,r2,t2; scanf("%lld %lld %lld",&l1,&r1,&t1); scanf("%lld %lld %lld",&l2,&r2,&t2); ll d=__gcd(t1,t2); if(abs(l2-l1)%d==0) { printf("%lld\n",min(r1-l1+1,r2-l2+1)); return 0; } ll d1=(l2-l1)%d,d2=(l1-l2)%d; if(d1<0) d1+=d; if(d2<0) d2+=d; printf("%lld\n",max(1LL*0,max(min(r1-l1-d1+1,r2-l2+1),min(r1-l1+1,r2-l2-d2+1))));}
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