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답안 #732123

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
732123 2023-04-28T13:52:43 Z LucaIlie 3단 점프 (JOI19_jumps) C++17
100 / 100
 1407 ms 98156 KB 
#include <bits/stdc++.h>

using namespace std;

struct ab {
    int a, b;
};

const int inf = 4e8;
struct info {
    int maxAB, maxC, maxABC;

    info operator + ( const info &x ) const {
        info ans;

        ans.maxAB = max( maxAB, x.maxAB );
        ans.maxC = max( maxC, x.maxC );
        ans.maxABC = max( max( maxABC, x.maxABC ), maxAB + x.maxC );

        return ans;
    }
};

struct update {
    int pos, val;
};

struct query {
    int l, r, p;
};

const int MAX_N = 5e5;
const int MAX_Q = 5e5;
int val[MAX_N + 1], ans[MAX_Q];
vector<ab> pairs;
vector<update> updates[MAX_N + 1];
vector<query> queries[MAX_N + 1];

struct SegTree {
    info segTree[4 * MAX_N];

    void init( int v, int l, int r ) {
        if ( l == r ) {
            segTree[v] = { -inf, val[l], -inf };
            return;
        }
        int mid = (l + r) / 2;
        init( v * 2 + 1, l, mid );
        init( v * 2 + 2, mid + 1, r );
        segTree[v].maxC = max( segTree[v * 2 + 1].maxC, segTree[v * 2 + 2].maxC );
    }

    void update( int v, int l, int r, int pos, int val ) {
        if ( l > pos || r < pos )
            return;

        if ( l == r ) {
            segTree[v].maxAB = max( segTree[v].maxAB, val );
            segTree[v].maxABC = segTree[v].maxAB + segTree[v].maxC;

            return;
        }

        int mid = (l + r) / 2;
        update( v * 2 + 1, l, mid, pos, val );
        update( v * 2 + 2, mid + 1, r, pos, val );
        segTree[v] = segTree[v * 2 + 1] + segTree[v * 2 + 2];
        //printf( "udpate %d %d %d %d %d\n", l, r, segTree[v].maxAB, segTree[v].maxC, segTree[v].maxABC );
    }

    info query( int v, int l, int r, int lq, int rq ) {
        if ( l > rq || r < lq )
            return { -inf, -inf, -inf };

        if ( lq <= l && r <= rq ) {
            //printf( "query %d %d %d %d %d\n", l, r, segTree[v].maxAB, segTree[v].maxC, segTree[v].maxABC );
            return segTree[v];
        }

        int mid = (l + r) / 2;
        return query( v * 2 + 1, l, mid, lq, rq ) + query( v * 2 + 2, mid + 1, r, lq, rq );
    }
};

SegTree maxJump;

int main() {
    int n;

    cin >> n;
    for ( int i = 1; i <= n; i++ )
        cin >> val[i];

    stack <int> s;
    for ( int i = 1; i <= n; i++ ) {
        while ( !s.empty() && val[i] >= val[s.top()] ) {
            pairs.push_back( { s.top(), i } );
            s.pop();
        }
        if ( !s.empty() )
            pairs.push_back( { s.top(), i } );
        s.push( i );
    }


    for ( ab x: pairs )
        updates[x.a].push_back( { 2 * x.b - x.a, val[x.a] + val[x.b] } );//, printf( "%d %d\n", x.a, x.b );

    int q;
    cin >> q;
    for ( int i = 0; i < q; i++ ) {
        int l, r;
        cin >> l >> r;
        queries[l].push_back( { l, r, i } );
    }

    maxJump.init( 0, 1, n );
    for ( int i = n; i >= 1; i-- ) {
        for ( update u: updates[i] )
            maxJump.update( 0, 1, n, u.pos, u.val );//, printf( "u %d %d %d\n", i, u.pos, u.val );
        for ( query q: queries[i] )
            ans[q.p] = maxJump.query( 0, 1, n, q.l, q.r ).maxABC;//, printf( "q %d %d %d %d\n", i, q.l, q.r, q.p );
    }

    for ( int i = 0; i < q; i++ )
        cout << ans[i] << "\n";

    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23800 KB Output is correct
3 Correct 12 ms 23744 KB Output is correct
4 Correct 12 ms 23732 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 12 ms 23716 KB Output is correct
7 Correct 13 ms 23800 KB Output is correct
8 Correct 12 ms 23800 KB Output is correct
9 Correct 12 ms 23840 KB Output is correct
10 Correct 12 ms 23760 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23800 KB Output is correct
3 Correct 12 ms 23744 KB Output is correct
4 Correct 12 ms 23732 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 12 ms 23716 KB Output is correct
7 Correct 13 ms 23800 KB Output is correct
8 Correct 12 ms 23800 KB Output is correct
9 Correct 12 ms 23840 KB Output is correct
10 Correct 12 ms 23760 KB Output is correct
11 Correct 423 ms 46092 KB Output is correct
12 Correct 426 ms 45836 KB Output is correct
13 Correct 462 ms 45840 KB Output is correct
14 Correct 447 ms 46004 KB Output is correct
15 Correct 418 ms 46084 KB Output is correct
16 Correct 450 ms 45408 KB Output is correct
17 Correct 515 ms 45352 KB Output is correct
18 Correct 451 ms 45196 KB Output is correct
19 Correct 460 ms 45872 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 208 ms 43092 KB Output is correct
2 Correct 137 ms 40244 KB Output is correct
3 Correct 175 ms 41132 KB Output is correct
4 Correct 204 ms 43060 KB Output is correct
5 Correct 201 ms 43104 KB Output is correct
6 Correct 204 ms 42448 KB Output is correct
7 Correct 184 ms 42340 KB Output is correct
8 Correct 200 ms 42344 KB Output is correct
9 Correct 202 ms 42668 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 23764 KB Output is correct
2 Correct 12 ms 23800 KB Output is correct
3 Correct 12 ms 23744 KB Output is correct
4 Correct 12 ms 23732 KB Output is correct
5 Correct 12 ms 23764 KB Output is correct
6 Correct 12 ms 23716 KB Output is correct
7 Correct 13 ms 23800 KB Output is correct
8 Correct 12 ms 23800 KB Output is correct
9 Correct 12 ms 23840 KB Output is correct
10 Correct 12 ms 23760 KB Output is correct
11 Correct 423 ms 46092 KB Output is correct
12 Correct 426 ms 45836 KB Output is correct
13 Correct 462 ms 45840 KB Output is correct
14 Correct 447 ms 46004 KB Output is correct
15 Correct 418 ms 46084 KB Output is correct
16 Correct 450 ms 45408 KB Output is correct
17 Correct 515 ms 45352 KB Output is correct
18 Correct 451 ms 45196 KB Output is correct
19 Correct 460 ms 45872 KB Output is correct
20 Correct 208 ms 43092 KB Output is correct
21 Correct 137 ms 40244 KB Output is correct
22 Correct 175 ms 41132 KB Output is correct
23 Correct 204 ms 43060 KB Output is correct
24 Correct 201 ms 43104 KB Output is correct
25 Correct 204 ms 42448 KB Output is correct
26 Correct 184 ms 42340 KB Output is correct
27 Correct 200 ms 42344 KB Output is correct
28 Correct 202 ms 42668 KB Output is correct
29 Correct 1407 ms 93392 KB Output is correct
30 Correct 1100 ms 86288 KB Output is correct
31 Correct 1176 ms 88340 KB Output is correct
32 Correct 1322 ms 93372 KB Output is correct
33 Correct 1357 ms 93468 KB Output is correct
34 Correct 1281 ms 91028 KB Output is correct
35 Correct 1317 ms 90732 KB Output is correct
36 Correct 1281 ms 90800 KB Output is correct
37 Correct 1266 ms 92204 KB Output is correct
38 Correct 1144 ms 98156 KB Output is correct
39 Correct 1101 ms 98152 KB Output is correct
40 Correct 999 ms 94768 KB Output is correct
41 Correct 958 ms 94256 KB Output is correct
42 Correct 973 ms 94288 KB Output is correct
43 Correct 1039 ms 95972 KB Output is correct
44 Correct 1089 ms 97496 KB Output is correct
45 Correct 1120 ms 97472 KB Output is correct
46 Correct 1060 ms 94332 KB Output is correct
47 Correct 1035 ms 93976 KB Output is correct
48 Correct 1093 ms 93968 KB Output is correct
49 Correct 1037 ms 96020 KB Output is correct
50 Correct 1145 ms 95820 KB Output is correct
51 Correct 1133 ms 95732 KB Output is correct
52 Correct 1138 ms 93252 KB Output is correct
53 Correct 1072 ms 93116 KB Output is correct
54 Correct 1070 ms 93008 KB Output is correct
55 Correct 1109 ms 94660 KB Output is correct