Codeforces 1136 - A/B/C/D/E/F - (Undone)

链接：https://codeforces.com/contest/1136/

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A - Nastya Is Reading a Book - [二分]

#include<bits/stdc++.h>
using namespace std;
const int maxn=105;
int n,l[maxn],r[maxn],k;
int srch(int x)
{
    int L=1, R=n;
    while(L<R)
    {
        int M=(L+R)>>1;
        if(l[M]<=x && x<=r[M]) return M;
        else if(x<l[M]) R=M-1;
        else L=M+1;
    }
    return L;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++) cin>>l[i]>>r[i];
    cin>>k;

    cout<<n-srch(k)+1<<endl;
}

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B - Nastya Is Playing Computer Games - [思维题]

题解：我只想说，这道思维题有点东西……

AC代码：

#include<bits/stdc++.h>
using namespace std;
int n,k;
int main()
{
    cin>>n>>k;
    cout<<3*n+min(n-k,k-1)<<endl;
}