Submission #18067

#	Time	Username	Problem	Language	Result	Execution time	Memory
18067		tncks0121	즐거운 채소 기르기 (JOI14_growing)	C++14	100 / 100	273 ms	22248 KiB

growing

#define _CRT_SECURE_NO_WARNINGS
       
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <math.h>
#include <assert.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <functional>
#include <vector>
#include <deque>
#include <utility>
#include <bitset>
#include <limits.h>
#include <time.h>
#include <functional>
#include <numeric>
 
using namespace std;
typedef long long ll;
typedef unsigned long long llu;
typedef double lf;
typedef unsigned int uint;
typedef long double llf;
typedef pair<int, int> pii;

const int N_ = 300500;

int N, D[N_];
map<int, int> ren;

ll tb1[N_], tb2[N_];

const int SZ = 300500;

int tree[SZ+10];
void upd (int x, int d) {
    for(; x > 0 && x <= SZ; x += x & -x) tree[x] += d;
}
int get (int x) {
    int ret = 0;
    for(; x > 0; x -= x & -x) ret += tree[x];
    return ret;
}

int main() {
    scanf("%d", &N);
    for(int i = 1; i <= N; i++) {
        scanf("%d", &D[i]);
    }

    {
        int v = 0;    
        for(int i = 1; i <= N; i++) ren[D[i]] = -1;
        for(auto &it : ren) it.second = ++v;
        for(int i = 1; i <= N; i++) D[i] = ren[D[i]];
    }

    {
        memset(tree, 0, sizeof tree);
        for(int i = 1; i <= N; i++) {
            tb1[i] = (i-1) - get(D[i]);
            upd(D[i], +1);
        }

        memset(tree, 0, sizeof tree);
        for(int i = N; i > 0; i--) {
            tb2[i] = (N-i) - get(D[i]);
            upd(D[i], +1);
        }

        ll ans = 0;

        for(int i = 0; i <= N; i++) {
            ans += min(tb1[i], tb2[i]);
        }
        printf("%lld\n", ans);
    }


    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 15 / 15
• Subtask 4: 55 / 55