Submission #93286

#	Time	Username	Problem	Language	Result	Execution time	Memory
93286		toloraia	Simple game (IZhO17_game)	C++14	100 / 100	513 ms	18896 KiB

game

#include <bits/stdc++.h>

using namespace std;

const int N = 4e6 + 5, M = (1<<20);

int T[N];
int sh[N];

void update (int k, int l, int r, int L, int R, int x){
    if (r < L || R < l)
        return;
    if (L <= l && r <= R){
        T[k] += (r - l + 1) * x;
        sh[k] += x;
        return;
    }
    update (k * 2,     l,               (l + r) / 2, l,               (l + r) / 2, sh[k]);
    update (k * 2 + 1, (l + r) / 2 + 1, r,           (l + r) / 2 + 1,  r,          sh[k]);
    update (k * 2,     l,               (l + r) / 2, L, R, x);
    update (k * 2 + 1, (l + r) / 2 + 1, r,           L, R, x);
    sh[k] = 0;
    T[k] = T[k * 2] + T[k * 2 + 1];
}

int calc (int k, int l, int r, int x){
    if (r < x || x < l)
        return 0;
    if (l == r)
        return T[k];
    update (k * 2,     l,               (l + r) / 2, l,               (l + r) / 2, sh[k]);
    update (k * 2 + 1, (l + r) / 2 + 1, r,           (l + r) / 2 + 1,  r,          sh[k]);
    sh[k] = 0;
    T[k] = T[k * 2] + T[k * 2 + 1];
    return calc (k * 2,     l,               (l + r) / 2, x) +
           calc (k * 2 + 1, (l + r) / 2 + 1, r,           x);
}

int n, m;
int a[N];


int main()
{
    ios::sync_with_stdio(false);
    cin>>n>>m;
    for (int i = 1; i <= n; i++)
        cin>>a[i];
    for (int i = 1; i < n; i++){
        int x = min (a[i], a[i + 1]);
        int y = max (a[i], a[i + 1]);
        update (1, 1, M, x, y, 1);
    }
    while (m--){
        int t;
        cin>>t;
        if (t == 1){
            int l, x;
            cin>>l>>x;
            if (l > 1){
                update (1, 1, M, min (a[l], a[l - 1]), max (a[l], a[l - 1]), -1);
                update (1, 1, M, min (x, a[l - 1]), max (x, a[l - 1]), 1);
            }
            if (l < n){
                update (1, 1, M, min (a[l], a[l + 1]), max (a[l], a[l + 1]), -1);
                update (1, 1, M, min (x, a[l + 1]), max (x, a[l + 1]), 1);
            }
            a[l] = x;
            continue;
        }
        int x;
        cin>>x;
        cout<<calc (1, 1, M, x)<<endl;
    }
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 27 / 27
• Subtask 3: 51 / 51