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Submission #469161

# Submission time Handle Problem Language Result Execution time Memory
469161 2021-08-31T03:14:58 Z Cross_Ratio Strange Device (APIO19_strange_device) C++14
65 / 100
 1030 ms 48288 KB 
#include <bits/stdc++.h>
#define int long long
using namespace std;
int gcd(int a, int b) {
    a = abs(a);
    b = abs(b);
    if(a < b) swap(a, b);
    while(b) {
        a %= b;
        swap(a, b);
    }
    return a;
}
vector<int> B;
int getidx(int n) {
    return lower_bound(B.begin(),B.end(),n) - B.begin();
}
struct SegTree {
    vector<int> seg;
    int MAX;
    SegTree(int N) {
        int i;
        for(i=2;i<2*N;i*=2) {}
        seg.resize(i);
        MAX = i;
    }
    int sum(int s, int e, int n, int ns, int ne) {
        if(e<=ns||ne<=s) return 0;
        if(s<=ns&&ne<=e) return seg[n];
        int mid = ns + ne >> 1;
        return sum(s, e, 2*n, ns, mid) + sum(s, e, 2*n+1, mid, ne);
    }
    void update(int n) {
        n += MAX/2;
        n /= 2;
        while(n) {
            seg[n] = seg[2*n] + seg[2*n+1];
            n /= 2;
        }
    }
    void Plus(int n) {
        seg[n+MAX/2]++;
        update(n);
    }
    void Minus(int n) {
        seg[n+MAX/2]--;
        update(n);
    }
    int sum(int s, int e) {
        return sum(s, e, 1, 0, MAX/2);
    }
};
int L[1000005];
int R[1000005];
main() {
    cin.sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int N, a, b;
    cin >> N >> a >> b;
    int d = gcd(a, b + 1);
    int c = a / d;
    assert(a % d == 0);
    int k = b * c;
    int l, r;

    int i;
    B.push_back(0);
    B.push_back(k);
    for(i=0;i<N;i++) {
        cin >> L[i] >> R[i];
        L[i] %= k;
        R[i] %= k;
        R[i]++;
        B.push_back(L[i]);
        B.push_back(R[i]);
    }
    sort(B.begin(),B.end());
    B.erase(unique(B.begin(),B.end()),B.end());
    SegTree tree(B.size() + 10);
    for(i=0;i<N;i++) {
        int l = getidx(L[i]);
        int r = getidx(R[i]);
        if(l < r) {
            tree.Plus(l);
            tree.Minus(r);
        }
        else {
            tree.Plus(0);
            tree.Minus(r);
            tree.Plus(l);
            tree.Minus(B.size()-1);
        }
    }
    int cnt = 0;
    for(i=0;i<B.size()-1;i++) {
        if(tree.sum(0,i+1)!=0) {
            cnt += B[i+1]-B[i];
        }
    }
    cout << cnt;
}

Compilation message

strange_device.cpp: In member function 'long long int SegTree::sum(long long int, long long int, long long int, long long int, long long int)':
strange_device.cpp:30:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   30 |         int mid = ns + ne >> 1;
      |                   ~~~^~~~
strange_device.cpp: At global scope:
strange_device.cpp:55:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   55 | main() {
      | ^~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:96:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   96 |     for(i=0;i<B.size()-1;i++) {
      |             ~^~~~~~~~~~~
strange_device.cpp:65:9: warning: unused variable 'l' [-Wunused-variable]
   65 |     int l, r;
      |         ^
strange_device.cpp:65:12: warning: unused variable 'r' [-Wunused-variable]
   65 |     int l, r;
      |            ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 9 ms 1004 KB Output is correct
3 Correct 9 ms 976 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 8 ms 980 KB Output is correct
17 Correct 91 ms 5648 KB Output is correct
18 Correct 0 ms 204 KB Output is correct

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 2 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 408 ms 31648 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 978 ms 48176 KB Output is correct
3 Correct 960 ms 48232 KB Output is correct
4 Correct 971 ms 48280 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 978 ms 48176 KB Output is correct
3 Correct 960 ms 48232 KB Output is correct
4 Correct 971 ms 48280 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 891 ms 48172 KB Output is correct
7 Correct 913 ms 48172 KB Output is correct
8 Correct 926 ms 48248 KB Output is correct
9 Correct 1030 ms 48288 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 978 ms 48176 KB Output is correct
3 Correct 960 ms 48232 KB Output is correct
4 Correct 971 ms 48280 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 86 ms 5520 KB Output is correct
7 Correct 101 ms 5572 KB Output is correct
8 Correct 82 ms 5524 KB Output is correct
9 Correct 92 ms 5636 KB Output is correct
10 Correct 89 ms 5760 KB Output is correct
11 Correct 90 ms 5644 KB Output is correct
12 Correct 85 ms 5564 KB Output is correct
13 Correct 96 ms 5616 KB Output is correct
14 Correct 88 ms 5652 KB Output is correct
15 Correct 93 ms 5560 KB Output is correct
16 Correct 96 ms 5600 KB Output is correct
17 Correct 87 ms 5632 KB Output is correct
18 Correct 917 ms 48172 KB Output is correct
19 Correct 936 ms 48176 KB Output is correct
20 Correct 1006 ms 48172 KB Output is correct
21 Correct 105 ms 5640 KB Output is correct
22 Correct 85 ms 5532 KB Output is correct
23 Correct 161 ms 12708 KB Output is correct

Subtask #7
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 103 ms 5584 KB Output is correct
3 Correct 98 ms 5636 KB Output is correct
4 Correct 1018 ms 48244 KB Output is correct
5 Correct 109 ms 5624 KB Output is correct
6 Correct 92 ms 5584 KB Output is correct
7 Correct 94 ms 5544 KB Output is correct
8 Correct 91 ms 5640 KB Output is correct
9 Correct 97 ms 5788 KB Output is correct
10 Correct 93 ms 5676 KB Output is correct
11 Correct 92 ms 5560 KB Output is correct
12 Correct 85 ms 5580 KB Output is correct
13 Correct 92 ms 5592 KB Output is correct
14 Correct 1008 ms 48172 KB Output is correct
15 Correct 91 ms 5632 KB Output is correct
16 Correct 907 ms 48240 KB Output is correct
17 Correct 946 ms 48228 KB Output is correct
18 Correct 1 ms 204 KB Output is correct

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 9 ms 1004 KB Output is correct
3 Correct 9 ms 976 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 332 KB Output is correct
16 Correct 8 ms 980 KB Output is correct
17 Correct 91 ms 5648 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Incorrect 1 ms 204 KB Output isn't correct
21 Halted 0 ms 0 KB -