oj.uz

답안 #758861

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
758861 2023-06-15T11:37:45 Z keta_tsimakuridze 허수아비 (JOI14_scarecrows) C++14
100 / 100
 1039 ms 35144 KB 
#include<bits/stdc++.h>
#define f first
#define s second
#define int long long
#define pii pair<int,int>
using namespace std;
const int N = 4e5 + 5, mod = 1e9 + 7; // !
int D[N], U[N], t[N];
pair<int,int> e[N];
int ans = 0;
vector<int> x;
void upd(int id, int v) {
    id = max(id, 1ll);
    for(id; id <= (int)x.size(); id += id & (-id)) t[id] += v;
}
int get(int id) {
    int ans = 0;
    for(id; id >= 1; id -= id & (-id)) ans += t[id];
    return ans;
}
//vector<pair<int,int>> x;
void solve(int l, int r) {
    if(l == r) return;
    int mid = (l + r) / 2;
    vector<pair<int,int>> X, Y;
    set<int> s; s.insert(0);
    for(int i = mid + 1; i <= r; i++) {
        D[i] = *--s.upper_bound(e[i].s);
        X.push_back({e[i].s, D[i]}); // e[i].s ---- D[i] chatvlit ramdeni iseti tipiiiaaaa rom U[j] >= e[i].s DAAA e[j].s <= e[i].s && e[j].s >= D[u]
        s.insert(e[i].s);
        // sadamde awyobs chasvla
    }
    s.clear(); s.insert((int)x.size() + 1);
    for(int i = mid; i >= l; i--) {
        U[i] = *s.upper_bound(e[i].s);
        s.insert(e[i].s);
        Y.push_back({U[i], e[i].s});
    }
    sort(X.rbegin(), X.rend());
    sort(Y.begin(), Y.end());
    vector<int> roll;
    for(int i = 0; i < (int)X.size(); i++) {
        while(Y.size() && Y.back().f >= X[i].f) {
            roll.push_back(Y.back().s);
            upd(Y.back().s, 1);
            Y.pop_back();
        }
        ans += get(X[i].f) - get(X[i].s - 1);
    }
    while(roll.size()) upd(roll.back(), -1), roll.pop_back();
//    cout << ans;
//    exit(0);
    solve(l, mid); solve(mid + 1, r);
}
int GET(int b) {
    return (lower_bound(x.begin(), x.end(), b) - x.begin()) + 1;
}
main(){
    int n;
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> e[i].f >> e[i].s;
        x.push_back(e[i].f);
        x.push_back(e[i].s);
    }
    sort(x.begin(), x.end());
    x.erase(unique(x.begin(), x.end()), x.end());
    for(int i = 1; i <= n; i++) {
        e[i].f = GET(e[i].f);
        e[i].s = GET(e[i].s);
    }

    sort(e + 1, e + n + 1);

    solve(1, n);
    cout << ans;
 }

Compilation message

scarecrows.cpp: In function 'void upd(long long int, long long int)':
scarecrows.cpp:14:9: warning: statement has no effect [-Wunused-value]
   14 |     for(id; id <= (int)x.size(); id += id & (-id)) t[id] += v;
      |         ^~
scarecrows.cpp: In function 'long long int get(long long int)':
scarecrows.cpp:18:9: warning: statement has no effect [-Wunused-value]
   18 |     for(id; id >= 1; id -= id & (-id)) ans += t[id];
      |         ^~
scarecrows.cpp: At global scope:
scarecrows.cpp:58:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   58 | main(){
      | ^~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 2 ms 320 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 12 ms 1104 KB Output is correct
2 Correct 17 ms 1216 KB Output is correct
3 Correct 15 ms 1240 KB Output is correct
4 Correct 11 ms 1052 KB Output is correct
5 Correct 15 ms 1108 KB Output is correct
6 Correct 16 ms 1236 KB Output is correct
7 Correct 16 ms 1236 KB Output is correct
8 Correct 12 ms 1236 KB Output is correct
9 Correct 16 ms 1236 KB Output is correct
10 Correct 16 ms 1240 KB Output is correct
11 Correct 16 ms 1228 KB Output is correct
12 Correct 12 ms 1036 KB Output is correct

Subtask #3
85.0 / 85.0

# 결과 실행 시간 메모리 Grader output
1 Correct 667 ms 32228 KB Output is correct
2 Correct 1027 ms 34968 KB Output is correct
3 Correct 830 ms 34756 KB Output is correct
4 Correct 591 ms 31740 KB Output is correct
5 Correct 870 ms 34632 KB Output is correct
6 Correct 957 ms 34936 KB Output is correct
7 Correct 990 ms 34884 KB Output is correct
8 Correct 1039 ms 34992 KB Output is correct
9 Correct 707 ms 35064 KB Output is correct
10 Correct 892 ms 34996 KB Output is correct
11 Correct 974 ms 34872 KB Output is correct
12 Correct 1026 ms 35144 KB Output is correct
13 Correct 1022 ms 35128 KB Output is correct
14 Correct 735 ms 35140 KB Output is correct
15 Correct 950 ms 34988 KB Output is correct
16 Correct 1025 ms 35060 KB Output is correct
17 Correct 595 ms 22256 KB Output is correct
18 Correct 1034 ms 34152 KB Output is correct
19 Correct 984 ms 33772 KB Output is correct
20 Correct 988 ms 33756 KB Output is correct