Submission #143811

#	Time	Username	Problem	Language	Result	Execution time	Memory
143811		MladenP	Money (IZhO17_money)	C++17	0 / 100	2 ms	376 KiB

money

#include <bits/stdc++.h>
#define MAXN 1000010
#define PRINT(x) cerr<<#x<<'='<<x<<endl;
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
using namespace std;
int a[MAXN], bit[MAXN], N, l, r;
pii b[MAXN];
int query(int idx) {
    int rez = 0;
    while(idx) {
        rez += bit[idx];
        idx -= idx&-idx;
    }
    return rez;
}
void update(int idx, int val) {
    while(idx < MAXN) {
        bit[idx] += val;
        idx += idx&-idx;
    }
}
int main() {
    cin >> N;
    for(int i = 1; i <= N; i++) cin >> a[i];
    for(int i = 1; i <= N; i++) b[i] = {a[i], i};
    sort(b+1, b+1+N);
    for(int i = 1; i <= N; i++) a[b[i].se] = i;
    for(int i = 1; i <= N; i++) update(i, +1);
    int rez = 1;
    update(a[1], -1);
    for(int i = 2; i <= N; i++) {
        update(a[i], -1);
        if(a[i-1] > a[i] || query(a[i]-1)-query(a[i-1]) != a[i]-a[i-1]-1) rez++;
    }
    cout << rez;
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55