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Submission #469172

# Submission time Handle Problem Language Result Execution time Memory
469172 2021-08-31T03:49:11 Z Cross_Ratio Strange Device (APIO19_strange_device) C++14
35 / 100
 1055 ms 48384 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];
bool Check(int a, int b) {
    int d = 1e9;
    int a1 = a / d;
    int a2 = a % d;
    int b1 = b / d;
    int b2 = b % d;
    if(a1&&b1) return true;
    if(a1*b2+a2*b1 >= d) return true;
    return false;
}
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;
    if(Check(b, c)) k = 1e18 + 5;
    else k = b * c;
    assert(k < 1e18 + 10);
    assert(k > 0);
    bool isAll = false;
    int i;
    B.push_back(0);
    B.push_back(k);
    for(i=0;i<N;i++) {
        cin >> L[i] >> R[i];
        if(R[i] - L[i] >= k-1) isAll = true;
        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());
        }
    }
    int cnt = 0;
    for(i=0;i<B.size()-1;i++) {
        if(tree.sum(0,i+1)!=0) {
            cnt += B[i+1]-B[i];
        }
    }
    if(isAll) cnt = k;
    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:65:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   65 | main() {
      | ^~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:110:14: 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]
  110 |     for(i=0;i<B.size()-1;i++) {
      |             ~^~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 9 ms 924 KB Output is correct
3 Correct 11 ms 976 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 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 0 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 0 ms 332 KB Output is correct
16 Correct 8 ms 976 KB Output is correct
17 Correct 91 ms 5628 KB Output is correct
18 Runtime error 2 ms 460 KB Execution killed with signal 6

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Runtime error 2 ms 460 KB Execution killed with signal 6

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 426 ms 31856 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 950 ms 48184 KB Output is correct
3 Correct 963 ms 48112 KB Output is correct
4 Correct 919 ms 48080 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 950 ms 48184 KB Output is correct
3 Correct 963 ms 48112 KB Output is correct
4 Correct 919 ms 48080 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 883 ms 48144 KB Output is correct
7 Correct 910 ms 48176 KB Output is correct
8 Correct 913 ms 48180 KB Output is correct
9 Correct 989 ms 48176 KB Output is correct

Subtask #6
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 950 ms 48184 KB Output is correct
3 Correct 963 ms 48112 KB Output is correct
4 Correct 919 ms 48080 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 86 ms 5540 KB Output is correct
7 Correct 89 ms 5728 KB Output is correct
8 Correct 84 ms 5640 KB Output is correct
9 Correct 109 ms 5640 KB Output is correct
10 Correct 87 ms 5560 KB Output is correct
11 Correct 92 ms 5564 KB Output is correct
12 Correct 85 ms 5648 KB Output is correct
13 Correct 95 ms 5524 KB Output is correct
14 Correct 84 ms 5560 KB Output is correct
15 Correct 108 ms 5596 KB Output is correct
16 Correct 96 ms 5700 KB Output is correct
17 Correct 85 ms 5560 KB Output is correct
18 Correct 903 ms 48184 KB Output is correct
19 Correct 935 ms 48232 KB Output is correct
20 Correct 1004 ms 48264 KB Output is correct
21 Correct 92 ms 5700 KB Output is correct
22 Correct 86 ms 5648 KB Output is correct
23 Correct 167 ms 12700 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 92 ms 5616 KB Output is correct
3 Correct 92 ms 5568 KB Output is correct
4 Correct 1055 ms 48172 KB Output is correct
5 Correct 94 ms 5632 KB Output is correct
6 Correct 92 ms 5572 KB Output is correct
7 Correct 107 ms 5616 KB Output is correct
8 Correct 89 ms 5560 KB Output is correct
9 Correct 91 ms 5608 KB Output is correct
10 Correct 91 ms 5552 KB Output is correct
11 Correct 95 ms 5712 KB Output is correct
12 Correct 84 ms 5540 KB Output is correct
13 Correct 92 ms 5632 KB Output is correct
14 Correct 994 ms 48356 KB Output is correct
15 Correct 107 ms 5644 KB Output is correct
16 Correct 934 ms 48384 KB Output is correct
17 Correct 893 ms 48168 KB Output is correct
18 Runtime error 2 ms 472 KB Execution killed with signal 6

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 9 ms 924 KB Output is correct
3 Correct 11 ms 976 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 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 0 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 0 ms 332 KB Output is correct
16 Correct 8 ms 976 KB Output is correct
17 Correct 91 ms 5628 KB Output is correct
18 Runtime error 2 ms 460 KB Execution killed with signal 6