Submission #1159945

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159945		guagua0407	Arranging Tickets (JOI17_arranging_tickets)	C++20	0 / 100	5 ms	12872 KiB

arranging_tickets

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2e5+5;
vector<int> sg(mxn*4);
vector<int> lazy(mxn*4);
int n,m;

void push(int v){
    if(lazy[v]!=0){
        sg[v*2]+=lazy[v];
        lazy[v*2]+=lazy[v];
        sg[v*2+1]+=lazy[v];
        lazy[v*2+1]+=lazy[v];
        lazy[v]=0;
    }
}

void update(int tl,int tr,int val,int l=1,int r=n,int v=1){
    if(r<tl or tr<l){
        return;
    }
    if(tl<=l and r<=tr){
        sg[v]+=val;
        lazy[v]+=val;
        return;
    }
    int mid=(l+r)/2;
    if(l<r) push(v);
    update(tl,min(mid,tr),val,l,mid,v*2);
    update(max(mid+1,tl),tr,val,mid+1,r,v*2+1);
    sg[v]=max(sg[v*2],sg[v*2+1]);
}

signed main() {_
    cin>>n>>m;
    ll ans=0;
    vector<vector<pair<pair<int,int>,ll>>> st(n+1);
    vector<vector<pair<pair<int,int>,ll>>> en(n+1);
    for(int i=0;i<m;i++){
        int l,r,c;
        cin>>l>>r>>c;
        if(l>r) swap(l,r);
        st[1].push_back({{l,r-1},c});
        en[l].push_back({{l,r-1},c});
        st[l].push_back({{1,l-1},c});
        st[l].push_back({{r,n},c});
        en[r].push_back({{1,l-1},c});
        en[r].push_back({{r,n},c});
        st[r].push_back({{l,r-1},c});
    }
    ll mx=0;
    for(int i=1;i<=n;i++){
        //cout<<i<<'\n';
        for(auto v:st[i]){
            if(v.f.f>v.f.s) continue;
            //cout<<v.f.f<<' '<<v.f.s<<' '<<v.s<<'\n';
            update(v.f.f,v.f.s,v.s);
        }
        for(auto v:en[i]){
            if(v.f.f>v.f.s) continue;
            //cout<<v.f.f<<' '<<v.f.s<<' '<<-v.s<<'\n';
            update(v.f.f,v.f.s,-v.s);
        }
        int cnt=sg[1];
        mx=max(mx,(cnt+1)/2);
    }
    cout<<mx<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz

Compilation message (stderr)

arranging_tickets.cpp: In function 'void setIO(std::string)':
arranging_tickets.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arranging_tickets.cpp:17:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 35
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 15