Submission #153890

#	Time	Username	Problem	Language	Result	Execution time	Memory
153890		DystoriaX	Strange Device (APIO19_strange_device)	C++14	65 / 100	626 ms	19280 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

int n;
long long a, b, mx;
vector<pair<long long, long long> > seg;

long long gcd(long long a, long long b){
    if(b == 0) return a;
    return gcd(b, a % b);
}

int main(){
    scanf("%d%lld%lld", &n, &a, &b);

    mx = a / gcd(a, b + 1);

    if(log10l(mx) + log10l(b) >= 18){
        mx = 1000000000000000000LL;
    } else mx *= b;

    for(int i = 0; i < n; i++){
        long long l, r;
        scanf("%lld%lld", &l, &r);

        l %= mx, r %= mx;

        if(r - l + 1 >= mx){
            seg.emplace_back(0, mx - 1);
        } else if (l <= r){
            seg.emplace_back(l, r);
        } else {
            seg.emplace_back(l, mx - 1);
            seg.emplace_back(0, r);
        }
    }

    sort(seg.begin(), seg.end());

    long long ans = 0, last = 0;

    for(auto k : seg){
        ans += max(0LL, k.second - max(last, k.first) + 1);
        last = max(last, k.second + 1);
    }

    printf("%lld\n", ans);
    
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%lld%lld", &n, &a, &b);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:25:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%lld%lld", &l, &r);
         ~~~~~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 20 / 20
• Subtask 8: 0 / 30