Submission #858608

#	Time	Username	Problem	Language	Result	Execution time	Memory
858608		resting	Overtaking (IOI23_overtaking)	C++17	0 / 100	9 ms	604 KiB

overtaking

#include <bits/stdc++.h>

using namespace std;
#define int long long

#define ff first
#define ss second

set<pair<int, int>> restriction; // if "starts after a", has to "end after b" yk

int x, l;
void init(int32_t L, int32_t N, std::vector<long long> T, std::vector<int32_t> W, int32_t X, int32_t M, std::vector<int32_t> S)
{
    x = X; l = L;
    vector<vector<pair<int, int>>> restrictions(M);// yes
    vector<pair<int, int>> cur;
    for (int i = 0; i < N; i++) if (W[i] > X) cur.push_back({ T[i], W[i] - X });
    for (int i = 0; i < M-1; i++) {
        sort(cur.begin(), cur.end());
        vector<pair<int, int>> res;
        const int T = cur.size();
        for (int j = 0; j < T; j++) 
            res.push_back({ cur[j].ff + cur[j].ss * (S[i + 1] - S[i]), cur[j].ss });
        for (int j = 0; j < T - 1; j++) 
            if (res[j].ff > res[j + 1].ff) 
                res[j + 1].ff = res[j].ff;
        int p  = -1;
        for (int j = 0; j < T; j++) {
            if(res[j].ff != p){
                if(j + 1 == T || cur[j].ff != cur[j+1].ff){
                    p = res[j].ff;
                    restrictions[i].push_back({ cur[j].ff+1, res[j].ff }); //start, end
                }
            }
        }
        swap(res, cur);
    }
    for (int i = 0; i < M; i++) {
        reverse(restrictions[i].begin(), restrictions[i].end());
        for(auto x : restrictions[i]){
            //insert x
            auto y = restriction.upper_bound(x);
            if(restriction.size() == 0) y = restriction.end();
            else if(y == restriction.begin()) y = restriction.end();
            else y = prev(y);
            if(y == restriction.end()){
                restriction.insert(x);
                continue;
            }
            if(y->second >= x.second) continue;
            int t = x.first;
            while(y != restriction.end() && y->second >= x.first){
                t = y->first;
                auto t = prev(y);
                restriction.erase(t);
                y = t;
            }
            restriction.insert({t, x.second});
        }
    }
    return;
}

long long arrival_time(long long Y)
{
    auto yes = prev(upper_bound(restriction.begin(), restriction.end(), make_pair( Y, numeric_limits<long long>::max() )));
    if (yes != restriction.end()) Y = max(Y, yes->second);
    return Y + x * l;
}

• Subtask 0: 0 / 0
• Subtask 1: 0 / 9
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 26
• Subtask 5: 0 / 35