oj.uz

답안 #48262

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
48262 2018-05-11T07:32:57 Z choikiwon 허수아비 (JOI14_scarecrows) C++17
15 / 100
 4000 ms 262144 KB 
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MN = 200010;
const int SQ = 300;
const int BS = (MN + SQ - 1) / SQ;

int N;
pii P[MN];
vector<pii> X, Y;
int invx[MN], invy[MN];
vector<pii> stk[BS];

int solve(int x) {
    int p = (P[x].second + SQ - 1) / SQ;

    vector<pii> tmp;
    for(int i = P[x].second + 1; i < min(N, p * SQ); i++) {
        if(invy[i] > x) tmp.push_back({ invy[i], i });
    }
    if(tmp.size() == 0) {
        return stk[p].size();
    }

    sort(tmp.begin(), tmp.end());

    vector<pii> tstk;
    for(int i = (int)tmp.size() - 1; i >= 0; i--) {
        while(tstk.size() && tstk.back().second >= tmp[i].second) tstk.pop_back();
        tstk.push_back(tmp[i]);
    }

    int s = 0, e = (int)stk[p].size() - 1, k = (int)stk[p].size();
    while(s <= e) {
        int m = (s + e)>>1;

        if(stk[p][m].first < tstk.back().first) {
            k = m;
            e = m - 1;
        }
        else s = m + 1;
    }

    return (int)stk[p].size() - k + (int)tstk.size();
}

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

    for(int i = 0; i < N; i++) {
        scanf("%d %d", &P[i].first, &P[i].second);
        X.push_back({ P[i].first, i });
        Y.push_back({ P[i].second, i });
    }
    sort(X.begin(), X.end());
    sort(Y.begin(), Y.end());
    for(int i = 0; i < N; i++) {
        P[ X[i].second ].first = i;
        P[ Y[i].second ].second = i;
    }
    for(int i = 0; i < N; i++) {
        invx[ P[i].first ] = P[i].second;
        invy[ P[i].second ] = P[i].first;
    }

    sort(P, P + N);

    ll ans = 0;
    for(int i = N - 1; i >= 0; i--) {
        ans += solve(i);

        for(int j = 0; j < BS; j++) {
            if(j * SQ > P[i].second) break;

            while(stk[j].size() && stk[j].back().second >= P[i].second) stk[j].pop_back();
            stk[j].push_back(P[i]);
        }
    }
    printf("%lld", ans);
}

Compilation message

scarecrows.cpp: In function 'int main()':
scarecrows.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &N);
     ~~~~~^~~~~~~~~~
scarecrows.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &P[i].first, &P[i].second);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 376 KB Output is correct
2 Correct 4 ms 624 KB Output is correct
3 Correct 3 ms 684 KB Output is correct
4 Correct 4 ms 684 KB Output is correct
5 Correct 4 ms 728 KB Output is correct
6 Correct 4 ms 880 KB Output is correct
7 Correct 2 ms 880 KB Output is correct
8 Correct 5 ms 880 KB Output is correct
9 Correct 4 ms 880 KB Output is correct
10 Correct 3 ms 880 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 1384 KB Output is correct
2 Correct 36 ms 1384 KB Output is correct
3 Correct 22 ms 1404 KB Output is correct
4 Correct 28 ms 1404 KB Output is correct
5 Correct 35 ms 1536 KB Output is correct
6 Correct 33 ms 1572 KB Output is correct
7 Correct 38 ms 1804 KB Output is correct
8 Correct 7 ms 2204 KB Output is correct
9 Correct 25 ms 2204 KB Output is correct
10 Correct 37 ms 2204 KB Output is correct
11 Correct 49 ms 2204 KB Output is correct
12 Correct 21 ms 2232 KB Output is correct

Subtask #3
0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4090 ms 262144 KB Time limit exceeded
2 Halted 0 ms 0 KB -