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Submission #469173

# Submission time Handle Problem Language Result Execution time Memory
469173 2021-08-31T03:50:41 Z Cross_Ratio Strange Device (APIO19_strange_device) C++14
35 / 100
 1051 ms 48400 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 + (a2*b2/d) >= 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 1 ms 204 KB Output is correct
2 Correct 10 ms 992 KB Output is correct
3 Correct 9 ms 1048 KB Output is correct
4 Correct 0 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 0 ms 204 KB Output is correct
13 Correct 0 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 976 KB Output is correct
17 Correct 89 ms 5564 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 204 KB Output is correct
3 Correct 0 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 1 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 419 ms 31708 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 930 ms 48248 KB Output is correct
3 Correct 948 ms 48172 KB Output is correct
4 Correct 900 ms 48180 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 930 ms 48248 KB Output is correct
3 Correct 948 ms 48172 KB Output is correct
4 Correct 900 ms 48180 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 883 ms 48152 KB Output is correct
7 Correct 917 ms 48168 KB Output is correct
8 Correct 910 ms 48264 KB Output is correct
9 Correct 1051 ms 48168 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 930 ms 48248 KB Output is correct
3 Correct 948 ms 48172 KB Output is correct
4 Correct 900 ms 48180 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 85 ms 5524 KB Output is correct
7 Correct 90 ms 5644 KB Output is correct
8 Correct 99 ms 5556 KB Output is correct
9 Correct 86 ms 5552 KB Output is correct
10 Correct 86 ms 5628 KB Output is correct
11 Correct 103 ms 5560 KB Output is correct
12 Correct 87 ms 5652 KB Output is correct
13 Correct 92 ms 5532 KB Output is correct
14 Correct 85 ms 5600 KB Output is correct
15 Correct 89 ms 5632 KB Output is correct
16 Correct 94 ms 5636 KB Output is correct
17 Correct 85 ms 5608 KB Output is correct
18 Correct 937 ms 48400 KB Output is correct
19 Correct 923 ms 48204 KB Output is correct
20 Correct 983 ms 48148 KB Output is correct
21 Correct 115 ms 5560 KB Output is correct
22 Correct 91 ms 5620 KB Output is correct
23 Correct 166 ms 12656 KB Output is correct

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 98 ms 5644 KB Output is correct
3 Correct 104 ms 5644 KB Output is correct
4 Correct 1028 ms 48132 KB Output is correct
5 Correct 92 ms 5644 KB Output is correct
6 Correct 92 ms 5568 KB Output is correct
7 Correct 91 ms 5548 KB Output is correct
8 Correct 89 ms 5640 KB Output is correct
9 Correct 90 ms 5640 KB Output is correct
10 Correct 91 ms 5556 KB Output is correct
11 Correct 92 ms 5672 KB Output is correct
12 Correct 87 ms 5608 KB Output is correct
13 Correct 95 ms 5544 KB Output is correct
14 Correct 1045 ms 48072 KB Output is correct
15 Correct 93 ms 5588 KB Output is correct
16 Correct 900 ms 48112 KB Output is correct
17 Correct 907 ms 48176 KB Output is correct
18 Runtime error 2 ms 460 KB Execution killed with signal 6

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 10 ms 992 KB Output is correct
3 Correct 9 ms 1048 KB Output is correct
4 Correct 0 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 0 ms 204 KB Output is correct
13 Correct 0 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 976 KB Output is correct
17 Correct 89 ms 5564 KB Output is correct
18 Runtime error 2 ms 460 KB Execution killed with signal 6