53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <string.h>
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#include <algorithm>
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using namespace std;
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typedef int ll;
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const int MAX_N = 10005;
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const ll MOD = 123456789;
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ll C[105][MAX_N];
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ll A[MAX_N],B[MAX_N];
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int len;
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int lowbit(int x){
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return x&(-x);
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}
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void add(int x,ll value, int floor){
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while(x<=len){
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C[floor][x]=(C[floor][x]+value)%MOD;
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x+=lowbit(x);
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}
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}
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ll sum(int x, int floor){
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ll ans=0;
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while(x>0){
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ans=(ans+C[floor][x])%MOD;
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x-=lowbit(x);
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}
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return ans;
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}
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int main()
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{
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int n,m;
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while(scanf("%d%d",&n,&m)==2){
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for(int i=0; i<n; ++i){
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scanf("%d",&A[i]);
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B[i] = A[i];
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}
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sort( B , B + n );
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len = unique(B,B+n)-B;
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memset(C,0,sizeof(C));
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for(int i =0; i<n; ++i){
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int loc = lower_bound(B,B+len,A[i])-B+1;
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add(loc,1,1);
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for(int j = 2; j<=m ; ++j ){
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ll num = sum(loc-1,j-1);
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add(loc,num,j);
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}
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}
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ll ans = sum(len,m);
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printf("%d\n",ans);
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}
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return 0;
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}
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