Submission #1281351

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281351		hihihihaw	Strange Device (APIO19_strange_device)	C++20	10 / 100	1079 ms	589824 KiB

strange_device

#pragma GCC optimize("O3,unroll-loops")    
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define ll long long
#define pb push_back
#define pii pair<int,int>
#define sz(v) (int)v.size()
#define fi first
#define se second
#define INF 1223372036854775807
#define INF2 122337203
#define MOD 1000000007
#define cint(x) int x;cin>>x;
#define cinarr(a,n) int a[n];for (int i=0;i<n;i++) cin>>a[i];
#define coutarr(a) for (auto d:a)cout<<d<<" "; cout<<endl;
#define coutarrD(a) for (auto d:a) cout<<d.fi<<","<<d.se<<" "; cout<<endl;
#define BERKAY_TUP ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double
#define mid (start+end)/2
#define vvi vector<vector<int>>
int t=1;
int interactive=0;
int usaco=0;
int testCase=0;
vector<int> lll;
vector<int> rr;
vector<int> sm;
vector<int> lazy;
int c=2;
void push(int n,int start,int end){
    if (lazy[n]){
        lazy[lll[n]]=1;
        lazy[rr[n]]=1;
        sm[lll[n]]=mid-start+1;
        sm[rr[n]]=end-mid;
    }
}
void update(int n,int start,int end,int l,int r){
    if (start>end || start>r || end<l) return;
    if (start>=l && end<=r){
        lazy[n]=1;
        sm[n]=(end-start+1);
        return;
    }
    if (lll[n]==0){
        lll.pb(0);rr.pb(0);sm.pb(0);lazy.pb(0);
        lll[n]=c;
        c++;
    }
    if (rr[n]==0){
        lll.pb(0);rr.pb(0);sm.pb(0);lazy.pb(0);
        rr[n]=c;
        c++;
    }
    push(n,start,end);
    update(lll[n],start,mid,l,r);
    update(rr[n],mid+1,end,l,r);
    sm[n]=sm[lll[n]]+sm[rr[n]];
}
void solve(){
    lll.pb(0);rr.pb(0);sm.pb(0);lazy.pb(0);
    lll.pb(0);rr.pb(0);sm.pb(0);lazy.pb(0);
    int n,a,b;
    cin>>n>>a>>b;
    int x;
    if (a>INF/b) x=INF;
    else x=a*b;
    for (int i=0;i<n;i++){
        int l,r;
        cin>>l>>r;
        if (l+x<=r){
            cout<<x<<endl;
            return;
        }
        else if (l%x+1<=r%x+1){
            update(1,1,x,l%x+1,r%x+1);
        }
        else{
            update(1,1,x,1,r%x+1);
            update(1,1,x,l%x+1,x);
        }

    }
    cout<<sm[1]<<endl;

    

    









}

 
 
 
 
 
 

 
int32_t main(){
    BERKAY_TUP;
    if (usaco){
        freopen("team.in", "r", stdin);
        freopen("team.out", "w", stdout);
    }
    if (!interactive){
    #ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out2.txt", "w", stdout);
        //freopen("wormsort.out", "w", stdout);
    #endif
    }
    if (t==1) solve();
    else{
        cin>>t;
        while (t--){testCase++;solve();}
    }
    
        
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:114:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  114 |         freopen("team.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:115:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  115 |         freopen("team.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 5 / 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