POJ 3484 二分

Showstopper

Description

Data-mining huge data sets can be a painful and long lasting process if we are not aware of tiny patterns existing within those data sets.

One reputable company has recently discovered a tiny bug in their hardware video processing solution and they are trying to create software workaround. To achieve maximum performance they use their chips in pairs and all data objects in memory should have even number of references. Under certain circumstances this rule became violated and exactly one data object is referred by odd number of references. They are ready to launch product and this is the only showstopper they have. They need YOU to help them resolve this critical issue in most efficient way.

Can you help them?

Input

Input file consists from multiple data sets separated by one or more empty lines.

Each data set represents a sequence of 32-bit (positive) integers (references) which are stored in compressed way.

Each line of input set consists from three single space separated 32-bit (positive) integers X Y Z and they represent following sequence of references: X, X+Z, X+2*Z, X+3*Z, …, X+K*Z, …(while (X+K*Z)<=Y).

Your task is to data-mine input data and for each set determine weather data were corrupted, which reference is occurring odd number of times, and count that reference.

Output

For each input data set you should print to standard output new line of text with either “no corruption” (low case) or two integers separated by single space (first one is reference that occurs odd number of times and second one is count of that reference).

Sample Input

Sample Output

1 1

no corruption

4 3

Source

Southeastern Europe 2007

题意：给出多组数据，每组间由多行空行隔开，每组数据包含多个数列，求在所有数列中出现次数为奇数次的数字。

思路：二分答案，求x以内的数字的总个数sum(x)，当sum(x)%2==1 时表明目标数字k<=x,否则k>x,以此来二分。

代码：

 //#include"bits/stdc++.h"

 #include<sstream>

 #include<iomanip>

 #include"cstdio"

 #include"map"

 #include"set"

 #include"cmath"

 #include"queue"

 #include"vector"

 #include"string"

 #include"cstring"

 #include"time.h"

 #include"iostream"

 #include"stdlib.h"

 #include"algorithm"

 #define db double

 #define ll long long

 #define vec vector<ll>

 #define mt  vector<vec>

 #define ci(x) scanf("%d",&x)

 #define cd(x) scanf("%lf",&x)

 #define cl(x) scanf("%lld",&x)

 #define pi(x) printf("%d\n",x)

 #define pd(x) printf("%f\n",x)

 #define pl(x) printf("%lld\n",x)

 //#define rep(i, x, y) for(int i=x;i<=y;i++)

 #define rep(i, n) for(int i=0;i<n;i++)

 const int N   = 1e6 + ;

 const int mod = 1e9 + ;

 const int MOD = mod - ;

 const int inf = 0x3f3f3f3f;

 const db  PI  = acos(-1.0);

 const db  eps = 1e-;

 using namespace std;

 ll x[N],y[N],z[N],cnt=;

 char s[N];

 ll cal(ll k)

 {

     ll ans=;

     for(int i=;i<cnt;i++){

         if(k<x[i]) continue;

         ans+=(min(y[i],k)-x[i])/z[i]+;//统计小于等于k的数有多少个

     }

     return ans;

 }

 ll solve()

 {

     ll l=-,r=(1ll<<),ans=-;

     while(l<=r)

     {

         ll mid=(l+r)/;

         if(cal(mid)%==) r=mid-,ans=mid;//若为奇数个则目标数字x<=mid

         else l=mid+;//否则目标数字x>mid

     }

     return ans;

 }

 int main()

 {

     cnt=;

     while(gets(s)!=NULL){

         if(strlen(s)==)

         {

             if(!cnt) continue;

             ll ret=solve();

             if(ret==-) puts("no corruption");

             else printf("%lld %lld\n",ret,cal(ret)-cal(ret-));

             cnt=;

         }

         else

         {

             sscanf(s,"%lld%lld%lld",&x[cnt],&y[cnt],&z[cnt]);//必须用sscanf？

             cnt++;

         }

     }

     if(cnt)

     {

         ll ret=solve();

         if(ret==-) puts("no corruption");

         else printf("%lld %lld\n",ret,cal(ret)-cal(ret-));

     }

     return ;

 }

巴特西

POJ 3484 二分

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