Submission #782492

#	Time	Username	Problem	Language	Result	Execution time	Memory
782492		devariaota	이상한 기계 (APIO19_strange_device)	C++17	5 / 100	383 ms	524288 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;

# define int long long
# define fir first
# define sec second
# define pb push_back

const int cnst = 2e5+5;
bool mutipletestcase = 0;
//bool debug = false;

int gcd(int a, int b) {return b ? gcd(b, a%b): a;}
int lcm(int a, int b) {return a/gcd(a, b+1)*b;}


void solve() {
    int n, a, b; cin >> n >> a >> b;

    pair<int, int> num[n+5];

    for(int i = 1; i<=n; i++) {
        int x, y; cin >> x >> y;
        num[i] = {x, y};
    }

    int val = lcm(a, b);
    
    int ans = 0;
    int get[val*2+5];
    memset(get, 0, sizeof(get));

    for(int i = 1; i<=n; i++) {
        int x, y; x = num[i].fir, y = num[i].sec;
        int len = y-x+1;
        if(len >= val) ans = val;
        x %= val;
        y %= val;
        if(!y) y += val;
        if(!x) x += val;
        if(y < x) y += val;
        // cerr << x << " " << y << endl;
        get[x]+=1, get[y+1] -= 1;
    }

    if(ans == val) cout << ans << endl;
    else {
        bool yes[val+5];
        memset(yes, 0, sizeof(yes));

        for(int i = 1; i<=2*val; i++) {
            get[i] += get[i-1];
            // cerr << i << " " << get[i] << " " << endl;
            // if(get[i]) cerr << i << " ";
            if(get[i]) yes[i%val] = 1;
        }
        for(int i = 0; i<=val; i++) {
            if(yes[i]) ans++;
        }

        cout << ans << endl;
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
    int t = 1;
    if(mutipletestcase) cin >> t; 
    while(t--) solve();
}

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