# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
1044713 | vjudge1 | Strange Device (APIO19_strange_device) | C++17 | 169 ms | 17104 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/* Author : Mychecksdead */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;
ll n, a, b;
vector<pair<ll, ll>> v;
void solve(){
cin >> n >> a >> b;
if(a > N || b > N || a*b > N) return;
ll g = gcd(b+1, a);
ll rep = b*a/g;
ll ans = 0, pref = -1, suf = rep;
for(int i = 1; i <= n; ++i){
ll t1, t2; cin >> t1 >> t2;
if(t1 + rep <= t2){
ans = rep;
}else{
if(t2 % rep < t1 % rep){
v.pb({0, t2 % rep});
v.pb({t1 % rep, rep - 1});
}else{
v.pb({t1%rep, t2%rep});
}
}
}
if(ans == rep) cout << ans;
else{
sort(all(v));
ll ans = rep;
if(v.size() && v[0].ff > 0) ans -= v[0].ff;
if(v.size() && v.back().ss < rep - 1) ans -= rep - v.back().ss - 1;
ll mx = v[0].ss;
for(int i = 1; i < v.size(); ++i){
if(v[i].ff > mx) ans -= v[i].ff - mx - 1;
mx = max(mx, v[i].ss);
}
// for(auto p: v) cout << p.ff << ' ' << p.ss << '\n';
cout << ans;
}
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int tt = 1, aa;
// freopen("in.txt", "r", stdin);
// freopen("out.txt", "w", stdout);
while(tt--){
solve();
en;
}
cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
return 0;
}
Compilation message (stderr)
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