oj.uz

답안 #48265

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
48265 2018-05-11T07:36:11 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 = 500;
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 5 ms 376 KB Output is correct
3 Correct 4 ms 552 KB Output is correct
4 Correct 5 ms 552 KB Output is correct
5 Correct 5 ms 608 KB Output is correct
6 Correct 5 ms 608 KB Output is correct
7 Correct 2 ms 608 KB Output is correct
8 Correct 4 ms 636 KB Output is correct
9 Correct 5 ms 772 KB Output is correct
10 Correct 3 ms 776 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 1168 KB Output is correct
2 Correct 65 ms 1276 KB Output is correct
3 Correct 30 ms 1336 KB Output is correct
4 Correct 40 ms 1336 KB Output is correct
5 Correct 49 ms 1548 KB Output is correct
6 Correct 51 ms 1648 KB Output is correct
7 Correct 54 ms 1720 KB Output is correct
8 Correct 6 ms 2016 KB Output is correct
9 Correct 34 ms 2016 KB Output is correct
10 Correct 48 ms 2016 KB Output is correct
11 Correct 54 ms 2136 KB Output is correct
12 Correct 30 ms 2176 KB Output is correct

Subtask #3
0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4136 ms 262144 KB Time limit exceeded
2 Halted 0 ms 0 KB -