BZOJ 1271 秦腾与教学评估

二分。

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#define maxn 200500
#define inf 3000000000LL
using namespace std;
long long t,n,s[maxn],e[maxn],d[maxn],cnt;
long long find(long long x)
{
    long long ret=0;
    for (long long i=1;i<=n;i++)
    {
        if (x>e[i]) ret+=(e[i]-s[i])/d[i]+1;
        else if (x>=s[i]) ret+=(x-s[i])/d[i]+1;
    }
    return ret;
}
void work()
{
    scanf("%lld",&n);cnt=0;
    for (long long i=1;i<=n;i++)
        scanf("%lld%lld%lld",&s[i],&e[i],&d[i]);
    long long l=1,r=inf,ans=-1;
    while (l<=r)
    {
        long long mid=l+r>>1,ret=find(mid);
        if (ret%2) {ans=mid;r=mid-1;}
        else l=mid+1;
    }
    if (ans==-1) printf("Poor QIN Teng:(
");
    else
    {
        for (int i=1;i<=n;i++)
        {
            if ((ans>=s[i]) && (ans<=e[i]) && ((ans-s[i])%d[i]==0))
                cnt++;
        }
        printf("%lld %lld
",ans,cnt);
    }
}
int main()
{
    scanf("%lld",&t);
    for (long long i=1;i<=t;i++)
        work();
    return 0;
}