Submission #120779

#	Time	Username	Problem	Language	Result	Execution time	Memory
120779		PeppaPig	Strange Device (APIO19_strange_device)	C++14	65 / 100	874 ms	33412 KiB

strange_device

#include <bits/stdc++.h>

#define long long long
#define pii pair<long, long>
#define x first
#define y second

using namespace std;

const int N = 1e6+5;

int n;
long A, B, cyc;
vector<pii> v;

int main() {
    scanf("%d %lld %lld", &n, &A, &B);
    cyc = A / __gcd(B+1, A);
    cyc *= B;

    for(int i = 1; i <= n; i++) {
        long l, r;
        scanf("%lld %lld", &l, &r);
        l %= cyc, r %= cyc;
        v.emplace_back(l, -1);
        v.emplace_back(r + 1, 1); 
        if(l > r) v.emplace_back(0, -1), v.emplace_back(cyc, 1);
    }
    sort(v.begin(), v.end());

    long pv = 0, cnt = 0, ans = 0;
    for(int i = 0; i < v.size(); i++) {
        if(cnt == 0) pv = v[i].x;
        cnt -= v[i].y;
        if(cnt == 0) ans += v[i].x - pv;
    }
    printf("%lld\n", ans);

    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:32:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < v.size(); i++) {
                    ~~^~~~~~~~~~
strange_device.cpp:17:10: 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:23:14: 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