Submission #781496

#	Time	Username	Problem	Language	Result	Execution time	Memory
781496		andecaandeci	Strange Device (APIO19_strange_device)	C++17	0 / 100	1 ms	212 KiB

strange_device

# include <bits/stdc++.h>
# define int long long
# define vi vector<int>
# define pb push_back
# define pii pair<int, int>
# define fi first
# define se second
# define endl '\n'
# define jess ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

int n, a, b;
pii r[1000005];

int ten(int x) {
    int ret=0;
    while(x>1) {
        x/=10;
        ret++;
    }
    return ret;
}

void solve() {
    cin >> n >> a >> b;
    int sum=0;
    bool st=1;
    for(int i=1; i<=n; i++) {
        cin >> r[i].fi >> r[i].se;
        if((1e18-sum)<(r[i].se-r[i].fi+1)) st=0;
        if(st) sum+=(r[i].se - r[i].fi + 1);
    }
    if(n==1) {
        if(ten(a)+ten(b)>=18) {
            cout << r[1].se - r[1].fi + 1 << endl;
        } else {
            cout << max(0LL, min(a*b-1, r[1].se) - r[1].fi + 1);
        }
    }
    else if(sum<=1e6) {
        set<pii> s;
        for(int i=1; i<=n; i++) {
            for(int j=r[i].fi; j<=r[i].se; j++) {
                int c=j + (j/b);
                int x=c%a;
                int y=j%b;
                // cout << "idx " << i  << " " << j << " : " << x << " " << y << endl;
                s.insert({x, y});
            }
        }
        cout << s.size() << endl;
    }
}
 
signed main() {
    jess;
    solve();
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 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