Hdu3233Matrix Power Series矩阵

前面就做过了。。。二分搞下

#include <cstdio>
#include <algorithm>
#include <iostream>
#include <string.h>
typedef long long LL;
using namespace std;
int n, M;
struct Matrix
{
    int m[40][40];
};

Matrix Mul(Matrix a, Matrix b)
{
    Matrix ans;
    for (int i = 0; i < n;i++)
    for (int j = 0; j < n; j++){
        ans.m[i][j] = 0;
        for (int k = 0; k < n; k++){
            ans.m[i][j] += a.m[i][k] * b.m[k][j];
            ans.m[i][j] %= M;
        }
    }
    return ans;
}

Matrix quick(Matrix a, int b)
{
    Matrix ans;
    for (int i = 0; i < n;i++)
    for (int j = 0; j < n; j++)
        ans.m[i][j] = (i == j);
    while (b){
        if (b & 1) ans = Mul(ans, a);
        a = Mul(a, a);
        b >>= 1;
    }
    return ans;
}

Matrix add(Matrix a, Matrix b)
{
    for (int i = 0; i < n;i++)
    for (int j = 0; j < n; j++)
        a.m[i][j] += b.m[i][j], a.m[i][j] %= M;
    return a;
}

Matrix gao(Matrix a, int len)
{
    if (len == 1) return a;
    Matrix ans;
    for (int i = 0; i < n;i++)
    for (int j = 0; j < n; j++) ans.m[i][j] = 0;
    Matrix t = gao(a, len >> 1);
    ans = add(ans, t);
    ans = add(ans, Mul(t, quick(a, (len >> 1))));
    if (len & 1) return add(ans, quick(a, len));
    else return ans;
}

int main()
{
    int k;
    while (cin >> n >> k >> M){
        Matrix ans;
        for (int i = 0; i < n;i++)
        for (int j = 0; j < n; j++)
            scanf("%d", &ans.m[i][j]);
        Matrix sum = gao(ans, k);
        for (int i = 0; i < n; i++){
            for (int j = 0; j < n; j++)
                cout << sum.m[i][j] << " ";
            cout << endl;
        }
    }
    return 0;
}