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답안 #115895

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
115895 2019-06-09T12:56:14 Z gs18081 허수아비 (JOI14_scarecrows) C++11
100 / 100
 242 ms 9612 KB 
#include <bits/stdc++.h>
#define MAXN 202020
using namespace std;
typedef pair<int,int> pi;
typedef tuple<int,int,int> ti;
typedef pair<vector<int>,vector<int> > pvi;
typedef long long int ll;
int N;
pi arr[MAXN];
ll ans;
vector<ti> dnc(int s,int e){
    vector<ti> ret;
    if(s==e){
        ret.push_back(ti(arr[s].first,arr[s].second,-1));
        return ret;
    }
    int m = (s+e)>>1;
    vector<ti> A = dnc(s,m);
    vector<ti> B = dnc(m+1,e);
    
    vector<pi> vect;
    int a = 0,b = 0;
    while(a < A.size()&&b < B.size()){
        if(get<1>(A[a]) < get<1>(B[b])){
            while(!vect.empty()&&vect.back().second < get<0>(A[a])) vect.pop_back();
            vect.push_back(pi(get<1>(A[a]),get<0>(A[a])));
            ret.push_back(A[a]);
            a++;
        }
        else{
            int p1 = lower_bound(vect.begin(),vect.end(),pi(get<2>(B[b]),-1)) - vect.begin();
            ans += vect.size() - p1;
            auto ptr = vect.end();
            int temp = get<2>(B[b]);
            if(!vect.empty()){
                ptr--;
                temp = max(get<2>(B[b]),ptr->first);
            }
            B[b] = ti(get<0>(B[b]),get<1>(B[b]),temp);
            ret.push_back(B[b]);
            b++;
        }
    }
    while(a < A.size()){
        while(!vect.empty()&&vect.back().first < get<0>(A[a])) vect.pop_back();
        vect.push_back(pi(get<0>(A[a]),get<1>(A[a])));
        ret.push_back(A[a]);
        a++;
    }
    while(b < B.size()){
        int p1 = lower_bound(vect.begin(),vect.end(),pi(get<2>(B[b]),-1)) - vect.begin();
        ans += vect.size() - p1;
        auto ptr = vect.end();
        int temp = get<2>(B[b]);
        if(!vect.empty()){
            ptr--;
            temp = max(get<2>(B[b]),ptr->first);
        }
        B[b] = ti(get<0>(B[b]),get<1>(B[b]),temp);
        ret.push_back(B[b]);
        b++;
    }
    return ret;
}
int main(){
    scanf("%d",&N);
    for(int i=0;i<N;i++){
        scanf("%d %d",&arr[i].first,&arr[i].second);
    }
    sort(arr,arr+N);
    dnc(0,N-1);
    printf("%lld\n",ans);
    return 0;
}

Compilation message

scarecrows.cpp: In function 'std::vector<std::tuple<int, int, int> > dnc(int, int)':
scarecrows.cpp:23:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(a < A.size()&&b < B.size()){
           ~~^~~~~~~~~~
scarecrows.cpp:23:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(a < A.size()&&b < B.size()){
                         ~~^~~~~~~~~~
scarecrows.cpp:44:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(a < A.size()){
           ~~^~~~~~~~~~
scarecrows.cpp:50:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(b < B.size()){
           ~~^~~~~~~~~~
scarecrows.cpp: In function 'int main()':
scarecrows.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
     ~~~~~^~~~~~~~~
scarecrows.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d",&arr[i].first,&arr[i].second);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 384 KB Output is correct
2 Correct 3 ms 384 KB Output is correct
3 Correct 2 ms 384 KB Output is correct
4 Correct 2 ms 384 KB Output is correct
5 Correct 2 ms 384 KB Output is correct
6 Correct 3 ms 384 KB Output is correct
7 Correct 2 ms 384 KB Output is correct
8 Correct 3 ms 384 KB Output is correct
9 Correct 2 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 668 KB Output is correct
2 Correct 7 ms 640 KB Output is correct
3 Correct 6 ms 768 KB Output is correct
4 Correct 6 ms 640 KB Output is correct
5 Correct 6 ms 640 KB Output is correct
6 Correct 7 ms 768 KB Output is correct
7 Correct 7 ms 640 KB Output is correct
8 Correct 6 ms 640 KB Output is correct
9 Correct 7 ms 640 KB Output is correct
10 Correct 7 ms 628 KB Output is correct
11 Correct 7 ms 640 KB Output is correct
12 Correct 5 ms 640 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 173 ms 8836 KB Output is correct
2 Correct 242 ms 8228 KB Output is correct
3 Correct 212 ms 9612 KB Output is correct
4 Correct 176 ms 8188 KB Output is correct
5 Correct 196 ms 8220 KB Output is correct
6 Correct 204 ms 8104 KB Output is correct
7 Correct 218 ms 8256 KB Output is correct
8 Correct 238 ms 8256 KB Output is correct
9 Correct 194 ms 9072 KB Output is correct
10 Correct 210 ms 9576 KB Output is correct
11 Correct 216 ms 8324 KB Output is correct
12 Correct 234 ms 8256 KB Output is correct
13 Correct 234 ms 8180 KB Output is correct
14 Correct 198 ms 9064 KB Output is correct
15 Correct 225 ms 8128 KB Output is correct
16 Correct 216 ms 8080 KB Output is correct
17 Correct 135 ms 5260 KB Output is correct
18 Correct 222 ms 8236 KB Output is correct
19 Correct 218 ms 8124 KB Output is correct
20 Correct 221 ms 8168 KB Output is correct