oj.uz

Submission #127229

# Submission time Handle Problem Language Result Execution time Memory
127229 2019-07-09T07:06:30 Z choikiwon Sushi (JOI16_sushi) C++17
5 / 100
 1176 ms 4100 KB 
#include<bits/stdc++.h>
using namespace std;

const int MN = 100010;
const int SQ = 500;
const int BS = (MN + SQ - 1) / SQ;

int N, Q;
int A[MN];

struct Query {
    int s, e, p;
};
Query query[MN];

int Xn;
vector<int> X;
unordered_map<int, int> dx;

struct Fenwick {
    int n;
    vector<int> tree;
    void init(int n_) {
        n = n_;
        tree = vector<int>(n + 1, 0);
    }
    void upd(int x, int v) {
        for(int i = x + 1; i <= n; i += (i & -i)) tree[i] += v;
    }
    int quer(int a) {
        if(a >= n) a = n - 1;
        int ret = 0;
        for(int i = a + 1; i >= 1; i -= (i & -i)) ret += tree[i];
        return ret;
    }
    int quer(int a, int b) {
        return quer(b) - quer(a - 1);
    }
};

Fenwick fw[BS], tmp;
vector<int> V[BS];
int S[MN], E[MN], P[MN];

void prop(int bid) {
    int l = bid * SQ;
    int r = min(N - 1, l + SQ - 1);

    vector<int> L;
    for(int i = l; i <= r; i++) {
        int s = 0, e = A[i], p = -1;
        while(s <= e) {
            int m = (s + e)>>1;

            int t = tmp.quer(m, Xn - 1);
            if(t >= fw[bid].quer(m - 1)) {
                p = m;
                s = m + 1;
            }
            else e = m - 1;
        }
        tmp.upd(A[i], 1);
        L.push_back(A[i]);
        A[i] = p;
    }

    for(int i = 0; i < L.size(); i++) {
        tmp.upd(L[i], -1);
    }
    for(int i = 0; i < V[bid].size(); i++) {
        fw[bid].upd(V[bid][i], -1);
    }
    V[bid].clear();
}

int proc1(int s, int e, int p) {
    int bid = s / SQ;
    prop(bid);

    for(int i = s; i <= e; i++) if(A[i] > p) swap(A[i], p);
    return p;
}
int proc2(int bid, int v) {
    int l = bid * SQ;
    int r = min(N - 1, l + SQ - 1);
    fw[bid].upd(v, 1);
    V[bid].push_back(v);

    int s = v + 1, e = Xn - 1, p = v;
    while(s <= e) {
        int m = (s + e)>>1;

        int cnt = 0;
        for(int i = l; i <= r; i++) if(A[i] >= m) cnt++;

        if(fw[bid].quer(m - 1) <= cnt) {
            p = m;
            s = m + 1;
        }
        else e = m - 1;
    }
    return p;
}

int solve(int s, int e, int p) {
    if(s / SQ == e / SQ) {
        return proc1(s, e, p);
    }
    else {
        p = proc1(s, (s / SQ + 1) * SQ - 1, p);
        for(int i = s / SQ + 1; i < e / SQ; i++) {
            p = proc2(i, p);
        }
        p = proc1(e / SQ * SQ, e, p);
        return p;
    }
}

int main() {
    scanf("%d %d", &N, &Q);

    for(int i = 0; i < N; i++) {
        scanf("%d", &A[i]);
        X.push_back(A[i]);
    }

    for(int i = 0; i < Q; i++) {
        int s, e, p; scanf("%d %d %d", &s, &e, &p);
        s--; e--;
        query[i] = {s, e, p};
        X.push_back(p);
    }

    sort(X.begin(), X.end());
    X.resize(unique(X.begin(), X.end()) - X.begin());
    Xn = X.size();
    for(int i = 0; i < Xn; i++) dx[X[i]] = i;
    for(int i = 0; i < N; i++) {
        A[i] = dx[A[i]];
    }
    for(int i = 0; i < Q; i++) {
        query[i].p = dx[query[i].p];
    }

    for(int i = 0; i < BS; i++) {
        fw[i].init(Xn);
    }
    tmp.init(Xn);

    for(int i = 0; i < Q; i++) {
        int s = query[i].s;
        int e = query[i].e;
        int p = query[i].p;

        if(s <= e) {
            printf("%d\n", X[ solve(s, e, p) ]);
        }
        else {
            p = solve(s, N - 1, p);
            printf("%d\n", X[ solve(0, e, p) ]);
        }
    }

}

Compilation message

sushi.cpp: In function 'void prop(int)':
sushi.cpp:67:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < L.size(); i++) {
                    ~~^~~~~~~~~~
sushi.cpp:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < V[bid].size(); i++) {
                    ~~^~~~~~~~~~~~~~~
sushi.cpp: In function 'int main()':
sushi.cpp:120:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &N, &Q);
     ~~~~~^~~~~~~~~~~~~~~~~
sushi.cpp:123:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
         ~~~~~^~~~~~~~~~~~~
sushi.cpp:128:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         int s, e, p; scanf("%d %d %d", &s, &e, &p);
                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 866 ms 3932 KB Output is correct
2 Correct 834 ms 3988 KB Output is correct
3 Correct 822 ms 4060 KB Output is correct
4 Correct 838 ms 3960 KB Output is correct
5 Correct 643 ms 2040 KB Output is correct
6 Correct 635 ms 1916 KB Output is correct
7 Correct 74 ms 504 KB Output is correct
8 Correct 75 ms 504 KB Output is correct
9 Correct 825 ms 4088 KB Output is correct
10 Correct 802 ms 4088 KB Output is correct
11 Correct 840 ms 3960 KB Output is correct
12 Correct 851 ms 3852 KB Output is correct
13 Correct 732 ms 2808 KB Output is correct
14 Correct 1176 ms 4072 KB Output is correct
15 Correct 1132 ms 4100 KB Output is correct
16 Correct 321 ms 3832 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 380 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 380 KB Output is correct
22 Correct 2 ms 376 KB Output is correct

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Execution timed out 22 ms 1912 KB Time limit exceeded (wall clock)
2 Halted 0 ms 0 KB -

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 866 ms 3932 KB Output is correct
2 Correct 834 ms 3988 KB Output is correct
3 Correct 822 ms 4060 KB Output is correct
4 Correct 838 ms 3960 KB Output is correct
5 Correct 643 ms 2040 KB Output is correct
6 Correct 635 ms 1916 KB Output is correct
7 Correct 74 ms 504 KB Output is correct
8 Correct 75 ms 504 KB Output is correct
9 Correct 825 ms 4088 KB Output is correct
10 Correct 802 ms 4088 KB Output is correct
11 Correct 840 ms 3960 KB Output is correct
12 Correct 851 ms 3852 KB Output is correct
13 Correct 732 ms 2808 KB Output is correct
14 Correct 1176 ms 4072 KB Output is correct
15 Correct 1132 ms 4100 KB Output is correct
16 Correct 321 ms 3832 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 380 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 380 KB Output is correct
22 Correct 2 ms 376 KB Output is correct
23 Execution timed out 22 ms 1912 KB Time limit exceeded (wall clock)
24 Halted 0 ms 0 KB -