【HDOJ】3473 Minimum Sum

划分树解。
主席树解MLE。

/* 3473 */
#include <iostream>
#include <sstream>
#include <string>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <vector>
#include <deque>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstring>
#include <climits>
#include <cctype>
#include <cassert>
#include <functional>
#include <iterator>
#include <iomanip>
using namespace std;
//#pragma comment(linker,"/STACK:102400000,1024000")

#define sti                set<int>
#define stpii            set<pair<int, int> >
#define mpii            map<int,int>
#define vi                vector<int>
#define pii                pair<int,int>
#define vpii            vector<pair<int,int> >
#define rep(i, a, n)     for (int i=a;i<n;++i)
#define per(i, a, n)     for (int i=n-1;i>=a;--i)
#define clr                clear
#define pb                 push_back
#define mp                 make_pair
#define fir                first
#define sec                second
#define all(x)             (x).begin(),(x).end()
#define SZ(x)             ((int)(x).size())
#define lson            l, mid, rt<<1
#define rson            mid+1, r, rt<<1|1
#define LL                __int64

const int maxn = 1e5+5;
int order[maxn];
int val[18][maxn];
int toLeft[18][maxn];
LL sum[18][maxn];
int n;
LL ans;

void Build(int l, int r, int dep) {
    if (l == r) {
        toLeft[dep][l] = toLeft[dep][l-1] + 1;
        sum[dep][l] = sum[dep][l-1] + val[dep][l];
        return ;
    }

    int mid = (l + r) >> 1;
    int same = mid - l + 1;
    rep(i, l, r+1) {
        if (val[dep][i] < order[mid])
            --same;
    }

    int lpos = l, rpos = mid + 1;
    rep(i, l, r+1) {
        if (val[dep][i] < order[mid]) {
            val[dep+1][lpos++] = val[dep][i];
        } else if (val[dep][i]==order[mid] && same>0) {
            val[dep+1][lpos++] = val[dep][i];
            --same;
        } else {
            val[dep+1][rpos++] = val[dep][i];
        }

        sum[dep][i] = sum[dep][i-1] + val[dep][i];
        toLeft[dep][i] = toLeft[dep][l-1] + lpos - l;
    }

    Build(l, mid, dep+1);
    Build(mid+1, r, dep+1);
}

int Query(int l, int r, int k, int L, int R, int dep) {
    if (l == r)
        return val[dep][l];

    int mid = (L + R) >> 1;
    int tmp = toLeft[dep][r] - toLeft[dep][l-1];

    if (tmp >= k) {
        int s = mid+1+l-L-(toLeft[dep][l-1] - toLeft[dep][L-1]);
        int e = mid+r-L+1 - (toLeft[dep][r] - toLeft[dep][L-1]);

        ans += sum[dep+1][e] - sum[dep+1][s-1];

        int ll = L + toLeft[dep][l-1] - toLeft[dep][L-1];
        int rr = ll + tmp - 1;

        return Query(ll, rr, k, L, mid, dep+1);
    } else {
        int s = L + toLeft[dep][l-1] - toLeft[dep][L-1];
        int e = s + tmp - 1;

        ans -= sum[dep+1][e] - sum[dep+1][s-1];

        k -= tmp;
        int rr = r + toLeft[dep][R] - toLeft[dep][r];
        int ll = rr - (r-l+1 - tmp) + 1;

        return Query(ll, rr, k, mid+1, R, dep+1);
    }
}

void solve() {
    int q;

    sort(order+1, order+1+n);
    Build(1, n, 0);

    int l, r, kth;
    int tmp;

    scanf("%d", &q);
    while (q--) {
        scanf("%d %d", &l, &r);
        ++l;
        ++r;
        kth = ((l + r) >> 1) - l + 1;
        ans = 0;
        tmp = Query(l, r, kth, 1, n, 0);
        if (((r-l+1) & 1) == 0)
            ans -= tmp;
        printf("%I64d\n", ans);
    }
}

int main() {
    ios::sync_with_stdio(false);
    #ifndef ONLINE_JUDGE
        freopen("data.in", "r", stdin);
        freopen("data.out", "w", stdout);
    #endif

    int t;

    scanf("%d", &t);
    rep(tt, 1, t+1) {
        scanf("%d", &n);
        rep(i, 1, n+1) {
            scanf("%d", &val[0][i]);
            order[i] = val[0][i];
        }
        printf("Case #%d:\n", tt);
        solve();
        putchar('\n');
    }

    #ifndef ONLINE_JUDGE
        printf("time = %d.\n", (int)clock());
    #endif

    return 0;
}

数据发生器。

from copy import deepcopy
from random import randint, shuffle
import shutil
import string


def GenDataIn():
    with open("data.in", "w") as fout:
        t = 10
        bound = 10**5
        fout.write("%d\n" % (t))
        for tt in xrange(t):
            n = bound
            q = randint(10, 20)
            fout.write("%d\n" % (n))
            L = []
            for i in xrange(n):
                x = randint(1, bound)
                L.append(x)
            fout.write(" ".join(map(str, L)) + "\n")
            fout.write("%d\n" % (q))
            for i in xrange(q):
                l = randint(0, n-1)
                r = randint(l, n-1)
                fout.write("%d %d\n" % (l, r))
                
            
                
def MovDataIn():
    desFileName = "F:\eclipse_prj\workspace\hdoj\data.in"
    shutil.copyfile("data.in", desFileName)

    
if __name__ == "__main__":
    GenDataIn()
    MovDataIn()