hdu5945 Fxx and game

单调队列学习
其实和单调栈类似
都是因为有些元素是没有价值的可以舍去

#include<bits/stdc++.h>
using namespace std;
#define sz(X) ((int)X.size())
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
typedef long long ll;
const int INF = 0x3f3f3f3f;
const int N = 1e6+5;

int X,k,t;
int dp[N], pos[N], val[N];
int main(){
    int _; scanf("%d",&_);
    while(_--) {
        scanf("%d %d %d",&X,&k,&t);
        if(t == 0) {
            int cc = 0;
            while(X) {
                X /= k; cc ++;
            }
            printf("%d
",cc-1);
            continue;
        }

        int l = 1; int r = 2; val[1] = 0; pos[1] = 1; dp[1] = 0;
        for(int i = 2; i <= X; ++i) {
            while(l < r && pos[l] < i-t) l++;

            dp[i] = val[l]+1;
            if(i%k == 0) {
                dp[i] = min(dp[i/k]+1, dp[i]);
            }

            while(l < r && val[r-1] >= dp[i]) r--;

            val[r] = dp[i]; pos[r] = i; r++;
        }

        printf("%d
",dp[X]);
    }
    return 0;
}