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Submission #469165

# Submission time Handle Problem Language Result Execution time Memory
469165 2021-08-31T03:24:07 Z Cross_Ratio Strange Device (APIO19_strange_device) C++14
65 / 100
 1056 ms 48304 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;
    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];
        }
    }
    //cnt = isAll ? k : cnt;
    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:97:14: 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]
   97 |     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;
      |            ^
strange_device.cpp:66:10: warning: variable 'isAll' set but not used [-Wunused-but-set-variable]
   66 |     bool isAll = false;
      |          ^~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 8 ms 976 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 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 0 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 91 ms 5560 KB Output is correct
18 Correct 1 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 0 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 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 422 ms 31712 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 934 ms 48156 KB Output is correct
3 Correct 946 ms 48164 KB Output is correct
4 Correct 928 ms 48120 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 934 ms 48156 KB Output is correct
3 Correct 946 ms 48164 KB Output is correct
4 Correct 928 ms 48120 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 874 ms 48264 KB Output is correct
7 Correct 944 ms 48164 KB Output is correct
8 Correct 968 ms 48192 KB Output is correct
9 Correct 988 ms 48172 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 934 ms 48156 KB Output is correct
3 Correct 946 ms 48164 KB Output is correct
4 Correct 928 ms 48120 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 101 ms 5644 KB Output is correct
7 Correct 90 ms 5644 KB Output is correct
8 Correct 82 ms 5756 KB Output is correct
9 Correct 89 ms 5608 KB Output is correct
10 Correct 87 ms 5528 KB Output is correct
11 Correct 95 ms 5648 KB Output is correct
12 Correct 84 ms 5644 KB Output is correct
13 Correct 93 ms 5620 KB Output is correct
14 Correct 85 ms 5632 KB Output is correct
15 Correct 99 ms 5560 KB Output is correct
16 Correct 92 ms 5632 KB Output is correct
17 Correct 86 ms 5644 KB Output is correct
18 Correct 937 ms 48184 KB Output is correct
19 Correct 975 ms 48268 KB Output is correct
20 Correct 985 ms 48212 KB Output is correct
21 Correct 96 ms 5548 KB Output is correct
22 Correct 89 ms 5520 KB Output is correct
23 Correct 166 ms 12720 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 90 ms 5600 KB Output is correct
3 Correct 94 ms 5520 KB Output is correct
4 Correct 1000 ms 48188 KB Output is correct
5 Correct 92 ms 5632 KB Output is correct
6 Correct 91 ms 5624 KB Output is correct
7 Correct 92 ms 5560 KB Output is correct
8 Correct 92 ms 5644 KB Output is correct
9 Correct 89 ms 5640 KB Output is correct
10 Correct 108 ms 5644 KB Output is correct
11 Correct 98 ms 5632 KB Output is correct
12 Correct 84 ms 5600 KB Output is correct
13 Correct 91 ms 5564 KB Output is correct
14 Correct 1056 ms 48304 KB Output is correct
15 Correct 90 ms 5644 KB Output is correct
16 Correct 906 ms 48212 KB Output is correct
17 Correct 892 ms 48168 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 8 ms 976 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 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 0 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 91 ms 5560 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 204 KB Output is correct
20 Incorrect 0 ms 204 KB Output isn't correct
21 Halted 0 ms 0 KB -