hdu 4768

二分查找
 1 #include<cstdio>
 2 #define min(a,b) (a<b?a:b)
 3 typedef __int64 LL;
 4 const int maxn=20000+5;
 5 LL a[maxn],b[maxn],c[maxn];
 6 int n;
 7 LL cal(LL m)
 8 {
 9     LL sum=0;
10     for(int i=0;i<n;i++)
11     {
12         int tmp=min(b[i],m);
13         if(tmp>=a[i])
14             sum+=(tmp-a[i])/c[i]+1;
15     }
16     return sum;
17 }
18 int main()
19 {
20     while(scanf("%d",&n)!=EOF)
21     {
22         for(int i=0;i<n;i++)
23             scanf("%I64d%I64d%I64d",&a[i],&b[i],&c[i]);
24         LL l=0,r=1LL<<31;
25         while(l<r)
26         {
27             LL mid=(l+r)>>1;
28             if(cal(mid)&1) r=mid;
29             else l=mid+1;
30         }
31         if(l==1LL<<31)
32             printf("DC Qiang is unhappy.
");
33         else
34         {
35             LL ans=0;
36             for(int i=0;i<n;i++)
37                 if(l>=a[i]&&l<=b[i]&&(l-a[i])%c[i]==0) ans++;
38               printf("%I64d %I64d
",l,ans);
39         }
40     }
41     return 0;
42 }