oj.uz

답안 #48263

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
48263 2018-05-11T07:33:52 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 = 200;
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 3 ms 376 KB Output is correct
2 Correct 5 ms 488 KB Output is correct
3 Correct 3 ms 488 KB Output is correct
4 Correct 4 ms 676 KB Output is correct
5 Correct 4 ms 756 KB Output is correct
6 Correct 4 ms 756 KB Output is correct
7 Correct 3 ms 872 KB Output is correct
8 Correct 4 ms 876 KB Output is correct
9 Correct 4 ms 876 KB Output is correct
10 Correct 3 ms 876 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 1576 KB Output is correct
2 Correct 29 ms 1576 KB Output is correct
3 Correct 17 ms 1576 KB Output is correct
4 Correct 21 ms 1576 KB Output is correct
5 Correct 25 ms 1576 KB Output is correct
6 Correct 26 ms 1576 KB Output is correct
7 Correct 26 ms 1656 KB Output is correct
8 Correct 6 ms 2396 KB Output is correct
9 Correct 18 ms 2396 KB Output is correct
10 Correct 25 ms 2396 KB Output is correct
11 Correct 26 ms 2396 KB Output is correct
12 Correct 22 ms 2396 KB Output is correct

Subtask #3
0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4144 ms 262144 KB Time limit exceeded
2 Halted 0 ms 0 KB -