Submission #932927

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
932927	2024-02-24 14:43:40	12345678	Strange Device (APIO19_strange_device)	C++17	35 / 100	674 ms	116052 KiB

strange_device

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#include <bits/stdc++.h>
using namespace std;
#define ll unsigned long long
const int nx=1e6+5;
ll n, a, b, l[nx], r[nx], sm, p, mx, res, tmp;
set<pair<ll, ll>> s;
void add_range(ll x, ll y)
{
    x=x%p;
    y=y%p;
    if (y<x) y+=p;
    s.insert({x, min(p-1, y)});
    if (y>=p) s.insert({0, y-p});
}
int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>a>>b;
    for (int i=1; i<=n; i++) cin>>l[i]>>r[i], mx=max(mx, r[i]-l[i]+1), sm+=(r[i]-l[i]+1);
    tmp=a/__gcd(a, b+1);
    if ((double) tmp * (double) (b) > r[n]) return sm, 0;
    p=tmp*b;
    if (mx>=p) return cout<<p, 0;
    for (int i=1; i<=n; i++) add_range(l[i], r[i]);
    //for (auto [x, y]:s) cout<<"val "<<x<<' '<<y<<'\n';
 
 
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Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:24:20: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   24 |     for (int i=1; i<=n; i++) cin>>l[i]>>r[i], mx=max(mx, r[i]-l[i]+1), sm+=(r[i]-l[i]+1);
      |                   ~^~~
strange_device.cpp:26:52: warning: left operand of comma operator has no effect [-Wunused-value]
   26 |     if ((double) tmp * (double) (b) > r[n]) return sm, 0;
      |                                                    ^~
strange_device.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare]
   29 |     for (int i=1; i<=n; i++) add_range(l[i], r[i]);
      |                   ~^~~

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• Subtask 8: 0 / 30