Submission #949813

#	Time	Username	Problem	Language	Result	Execution time	Memory
949813		dimashhh	Bulldozer (JOI17_bulldozer)	C++17	25 / 100	2021 ms	74932 KiB

bulldozer

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 4e5+ 5, MOD = 998244353;
#define int ll
int n,pos[N],t[N];
ll x[N],y[N],w[N];
vector<array<ll,3>> a;
void test() {
    cin >> n;
    for(int i = 1;i <= n;i++){
        cin >> x[i] >> y[i] >> w[i];
        a.push_back({x[i],-y[i],i});
    }
    if(n == 1){
        cout << max(0ll,w[1]) << '\n';
        return;
    }
    sort(a.begin(),a.end());
    for(int i = 0;i < (int)a.size();i++){
        pos[a[i][2]] = i + 1;
        t[i + 1] = a[i][2];
    }
    vector<pair<long double,pair<int,int>>> cur;
    for(int i = 1;i <= n;i++){
        for(int j = i+1;j <= n;j++){
            long double val = (long double)(y[j]-y[i]) / (long double)(x[j] - x[i]);
            cur.push_back({val,{i,j}});
        }
    }
    ll res = 0;
    sort(cur.rbegin(),cur.rend());
    for(int i = 0;i < (int)cur.size();i++){
        vector<pair<int,int>> ss;
        for(int j = i;j <= (int)cur.size();j++){
            if(j == (int)cur.size() || cur[j].first != cur[i].first){
                i = j - 1;
                break;
            }
            int L = min(pos[cur[j].second.first], pos[cur[j].second.second]), R = max(pos[cur[j].second.first],
                                                                                      pos[cur[j].second.second]);
            ss.push_back({L,R});
        }
        vector<ll> sums;
        sort(ss.begin(),ss.end());
        ll mn = 0,curs = 0;
        ll max_checked;
        for(int j = 0;j < (int)ss.size();j++) {
            if (j && max_checked >= ss[j].second) continue;
            int mx = ss[j].second;
            for (int k = j; k <= (int) ss.size(); k++) {
                if (k == (int) ss.size() || ss[k].first != ss[j].first) {
                    j = k - 1;
                    break;
                }
                max_checked = ss[k].second;
                mx = ss[k].second;
            }
            int l = ss[j].first, r = mx;
            while (l < r) {
                swap(t[l], t[r]);
                pos[t[l]] = l;
                pos[t[r]] = r;
                l++;
                r--;
            }
        }
        for(int j = 1;j <= n;j++){
            curs += w[t[j]];
            res = max(res,curs - mn);
            mn = min(mn,curs);
        }
    }
    cout << res << '\n';
}
signed main(){
    ios_base::sync_with_stdio(false);cin.tie(0);
    int T = 1;
//    cin >> T;
    while(T--){
        test();
    }
}

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