Submission #317790

#	Time	Username	Problem	Language	Result	Execution time	Memory
317790		tjdgus4384	Strange Device (APIO19_strange_device)	C++14	15 / 100	60 ms	4076 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
long long n, A, B, l[100001], r[100001];
vector<pair<long long, long long> > v;

int main(){
    scanf("%lld %lld %lld", &n, &A, &B);
    for(long long i = 0;i < n;i++){
        scanf("%lld %lld", &l[i], &r[i]);
    }
    long long g = __gcd((B+1)%A, A), t;
    bool chk = false;
    if(log10(A/g) + log10(B) > 18.7) chk = true;
    else t = (A/g) * B;
    for(long long i = 0;i < n;i++){
        if(chk){
            v.push_back({l[i], r[i]});
            continue;
        }
        if((r[i] - l[i] + 1) >= t){
            printf("%lld", t);
            return 0;
        }
        l[i] %= t;
        r[i] %= t;
        if(r[i] < l[i]){
            v.push_back({l[i], t-1});
            v.push_back({0, r[i]});
        }
        else v.push_back({l[i], r[i]});
    }
    sort(v.begin(), v.end());
    long long s = v[0].first, e = v[0].second, ans = 0;
    for(long long i = 1;i < v.size();i++){
        if(v[i].first <= e) e = max(e, v[i].second);
        else{
            ans += (e-s+1);
            s = v[i].first;
            e = v[i].second;
        }
    }
    ans += e-s+1;
    printf("%lld", ans);
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:34:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(long long i = 1;i < v.size();i++){
      |                         ~~^~~~~~~~~~
strange_device.cpp:7:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |     scanf("%lld %lld %lld", &n, &A, &B);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:9:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |         scanf("%lld %lld", &l[i], &r[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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