Submission #337919

#	Time	Username	Problem	Language	Result	Execution time	Memory
337919		Dilshod_Imomov	Divide and conquer (IZhO14_divide)	C++17	100 / 100	209 ms	60524 KiB

divide

# include <bits/stdc++.h>
# define speed ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
# define int long long
# define fi first
# define se second

using namespace std;

const int N = 1e6 + 7;
const int mod = 1e9 + 7;

int x[N], g[N], d[N], psg[N], psd[N], t[4 * N];

void upd( int v, int l, int r, int pos, int val ) {
    if ( l == r ) {
        t[v] = min( t[v], val );
        return;
    }
    int m = (l + r) / 2;
    if ( pos <= m ) {
        upd( v * 2, l, m, pos, val );
    }
    else {
        upd( v * 2 + 1, m + 1, r, pos, val );
    }
    t[v] = min( t[v * 2], t[v * 2 + 1] );
}

int get( int v, int l, int r, int tl, int tr ) {
    if ( tl > tr ) {
        return 1e18;
    }
    if ( tl == l && tr == r ) {
        return t[v];
    }
    int m = (l + r) / 2;
    int mn = get( v * 2, l, m, tl, min( tr, m ) );
    mn = min( mn, get( v * 2 + 1, m + 1, r, max( m + 1, tl ), tr ) );
    return mn;
}

int32_t main() {
    speed;
    for ( int i = 0; i < 4 * N; i++ ) {
        t[i] = 1e18;
    }
    int n;
    cin >> n;
    for ( int i = 1; i <= n; i++ ) {
        cin >> x[i] >> g[i] >> d[i];
        psg[i] = psg[i - 1] + g[i];
        psd[i] = psd[i - 1] + d[i];
    }
    int ans = 0, cnt = 1;
    set < int > st;
    map < int, int > mp, mp1;
    for ( int i = 1; i <= n; i++ ) {
        st.insert( x[i] - psd[i] );
        st.insert( x[i] - psd[i - 1] );
    }
    for ( auto i: st ) {
        // cout << i << ' ' << cnt << endl;
        mp[i] = cnt++;
    }
    for ( int i = 1; i <= n; i++ ) {
        int a = mp[x[i] - psd[i]];
        upd( 1, 1, cnt, mp[x[i] - psd[i - 1]], psg[i - 1] );
        // cout << "-> " << x[i] - psd[i - 1] << ' ' << mp[ x[i] - psd[i - 1] ] << ' ' << psg[i] << endl;
        // cout << i << ' ' << a << ' ' << get( 1, 1, cnt, a, cnt ) << endl;
        ans = max( ans, psg[i] - get( 1, 1, cnt, a, cnt ) );
    }
    cout << ans;
}

• Subtask 1: 17 / 17
• Subtask 2: 31 / 31
• Subtask 3: 52 / 52