Submission #597801

#	Time	Username	Problem	Language	Result	Execution time	Memory
597801		Ozy	Strange Device (APIO19_strange_device)	C++17	65 / 100	606 ms	33396 KiB

strange_device

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define lli unsigned long long int
#define debug(a) cout << #a << " = " << a << endl
#define debugsl(a) cout << #a << " = " << a << ", "
#define rep(i,a,b) for(int i = (a); i <= (b); i++)
#define repa(i,a,b) for(int i = (a); i >= (b); i--)

#define LIM (1ll << 60)

lli a,b,n,cont,x,y,mult,ini,res,k;
vector<pair<lli,lli> > orden;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> a >> b;
    k = __gcd(a,b+1);
    //debug(k);
    k = a/k;

    if (LIM/k < b) mult = LIM;
    else mult = k*b;

    rep(i,1,n) {
        cin >> x >> y;

        if (x == y) {
            x %= mult;
            orden.push_back({x,1});
            orden.push_back({x,2});
            continue;
        }

        x %= mult;
        y %= mult;

        if (x >= y) {
            orden.push_back({0,1});
            orden.push_back({mult-1,2});
        }
        orden.push_back({x,1});
        orden.push_back({y,2});
    }

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

    ini = -1;
    cont = 0;
    res = 0;
    for (auto act:orden) {

        if (act.second == 1) {
            cont++;
            if (ini == -1) ini = act.first;
        }
        else cont--;

        if (cont == 0) {
            res += (act.first - ini) + 1;
            ini = -1;
        }
    }

    cout << res;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:7:39: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
    7 | #define rep(i,a,b) for(int i = (a); i <= (b); i++)
      |                                       ^
strange_device.cpp:28:5: note: in expansion of macro 'rep'
   28 |     rep(i,1,n) {
      |     ^~~
strange_device.cpp:58:21: warning: comparison of integer expressions of different signedness: 'long long unsigned int' and 'int' [-Wsign-compare]
   58 |             if (ini == -1) ini = act.first;
      |                 ~~~~^~~~~

• 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