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Submission #99734

# Submission time Handle Problem Language Result Execution time Memory
99734 2019-03-06T11:13:45 Z songc 허수아비 (JOI14_scarecrows) C++14
100 / 100
 752 ms 67532 KB 
#include <bits/stdc++.h>
using namespace std;
typedef pair<int, int> pii;

int N;
long long ans;
pii A[202020];

struct Node{
    vector<pii> V;
    Node *lc=NULL, *rc=NULL;
};

void update(Node *now, int s, int e, pii P){
    if (e < P.second || P.second < s) return;
    if (s == e) {
        now->V.push_back(P);
        return;
    }
    int mid = (s+e)/2;
    if (now->lc == NULL) now->lc = new Node;
    update(now->lc, s, mid, P);
    if (now->rc == NULL) now->rc = new Node;
    update(now->rc, mid+1, e, P);

    while (!now->V.empty() && now->V.back().second < P.second) now->V.pop_back();
    now->V.push_back(P);
}

int query(Node *now, int s, int e, int xlim, int ylim){
    if (ylim < s) return xlim;
    if (e <= ylim){
        auto k = lower_bound(now->V.begin(), now->V.end(), pii(xlim, 0));
        if (k == now->V.end()) return xlim;
        ans += now->V.end() - k;
        return now->V.back().first;
    }
    int mid = (s+e)/2;
    if (now->rc != NULL) xlim = query(now->rc, mid+1, e, xlim, ylim);
    if (now->lc != NULL) xlim = query(now->lc, s, mid, xlim, ylim);
    return xlim;
}

int main(){
    scanf("%d", &N);
    for (int i=1; i<=N; i++) scanf("%d %d", &A[i].first, &A[i].second);
    sort(A+1, A+N+1, [&](pii X, pii Y){
        return X.second < Y.second;
    });
    for (int i=1; i<=N; i++) A[i].second = i;
    sort(A+1, A+N+1);
    Node *Tree = new Node;
    for (int i=1; i<=N; i++){
        query(Tree, 1, N, 0, A[i].second);
        update(Tree, 1, N, A[i]);
    }
    printf("%lld\n", ans);
    return 0;
}

Compilation message

scarecrows.cpp: In function 'int main()':
scarecrows.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
     ~~~~~^~~~~~~~~~
scarecrows.cpp:46:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i=1; i<=N; i++) scanf("%d %d", &A[i].first, &A[i].second);
                              ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 3 ms 384 KB Output is correct
5 Correct 3 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 2 ms 384 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 1792 KB Output is correct
2 Correct 13 ms 1280 KB Output is correct
3 Correct 11 ms 1536 KB Output is correct
4 Correct 8 ms 1280 KB Output is correct
5 Correct 11 ms 1252 KB Output is correct
6 Correct 11 ms 1280 KB Output is correct
7 Correct 12 ms 1380 KB Output is correct
8 Correct 9 ms 1920 KB Output is correct
9 Correct 10 ms 1408 KB Output is correct
10 Correct 11 ms 1308 KB Output is correct
11 Correct 13 ms 1252 KB Output is correct
12 Correct 5 ms 1252 KB Output is correct

Subtask #3
85.0 / 85.0

# Verdict Execution time Memory Grader output
1 Correct 314 ms 65336 KB Output is correct
2 Correct 649 ms 39072 KB Output is correct
3 Correct 311 ms 51548 KB Output is correct
4 Correct 200 ms 37044 KB Output is correct
5 Correct 326 ms 37688 KB Output is correct
6 Correct 462 ms 38688 KB Output is correct
7 Correct 602 ms 38880 KB Output is correct
8 Correct 615 ms 38988 KB Output is correct
9 Correct 340 ms 67532 KB Output is correct
10 Correct 395 ms 45960 KB Output is correct
11 Correct 520 ms 40608 KB Output is correct
12 Correct 628 ms 39312 KB Output is correct
13 Correct 752 ms 39072 KB Output is correct
14 Correct 337 ms 66348 KB Output is correct
15 Correct 551 ms 40652 KB Output is correct
16 Correct 715 ms 39176 KB Output is correct
17 Correct 299 ms 27040 KB Output is correct
18 Correct 497 ms 39056 KB Output is correct
19 Correct 401 ms 39096 KB Output is correct
20 Correct 466 ms 39052 KB Output is correct