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  • B. Dreamoon Likes Sequences

    Dreamoon likes sequences very much. So he created a problem about the sequence that you can't find in OEIS:

    You are given two integers d,md,m, find the number of arrays aa, satisfying the following constraints:

    • The length of aa is nn, n1n≥1
    • 1a1<a2<<and1≤a1<a2<⋯<an≤d
    • Define an array bb of length nn as follows: b1=a1b1=a1, i>1,bi=bi1ai∀i>1,bi=bi−1⊕ai, where ⊕ is the bitwise exclusive-or (xor). After constructing an array bb, the constraint b1<b2<<bn1<bnb1<b2<⋯<bn−1<bn should hold.

    Since the number of possible arrays may be too large, you need to find the answer modulo mm.

    Input

    The first line contains an integer tt (1t1001≤t≤100) denoting the number of test cases in the input.

    Each of the next tt lines contains two integers d,md,m (1d,m1091≤d,m≤109).

    Note that mm is not necessary the prime!

    Output

    For each test case, print the number of arrays aa, satisfying all given constrains, modulo mm.

    Example
    input
    Copy
    10
    1 1000000000
    2 999999999
    3 99999998
    4 9999997
    5 999996
    6 99995
    7 9994
    8 993
    9 92
    10 1
    
    output
    Copy
    1
    3
    5
    11
    17
    23
    29
    59
    89
    0
    
    #include <iostream>
    #include <vector>
    #include <algorithm>
    #include <string>
    #include <set>
    #include <queue>
    #include <map>
    #include <sstream>
    #include <cstdio>
    #include <cstring>
    #include <numeric>
    #include <cmath>
    #include <iomanip>
    #include <deque>
    #include <bitset>
    //#include <unordered_set>
    //#include <unordered_map>
    //#include <bits/stdc++.h>
    //#include <xfunctional>
    #define ll              long long
    #define PII             pair<int, int>
    #define rep(i,a,b)      for(int  i=a;i<=b;i++)
    #define dec(i,a,b)      for(int  i=a;i>=b;i--)
    #define pb              push_back
    #define mk              make_pair
    using namespace std;
    int dir[4][2] = { { 0,1 } ,{ 0,-1 },{ 1,0 },{ -1,0 } };
    const long long INF = 0x7f7f7f7f7f7f7f7f;
    const int inf = 0x3f3f3f3f;
    const double pi = 3.14159265358979;
    const int mod = 998244353;
    const int N = 2e5+5;
    //if(x<0 || x>=r || y<0 || y>=c)
    
    inline ll read()
    {
        ll x = 0; bool f = true; char c = getchar();
        while (c < '0' || c > '9') { if (c == '-') f = false; c = getchar(); }
        while (c >= '0' && c <= '9') x = (x << 1) + (x << 3) + (c ^ 48), c = getchar();
        return f ? x : -x;
    }
    
    ll gcd(ll m, ll n)
    {
        return n == 0 ? m : gcd(n, m%n);
    }
    
    int main()
    {
        vector<ll> a(33,1);
        for (int i = 1; i <= 32; i++)
        {
            a[i] = a[i - 1] * 2;
        }
        int T;
        cin >> T;
        while (T--)
        {
            ll d, m;
            cin >> d >> m;
            ll n=upper_bound(a.begin(), a.end(), d) - a.begin()-1;
            ll res=1;
            for (int i = 0; i < n; i++)
            {
                res *= (a[i] + 1)%m;
                res%=m;
            }
            res = res*(d - a[n] + 2) - 1;
            res = (res+m) % m;
            cout << res << endl;
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/dealer/p/12873519.html
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