Submission #846742

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
846742	2023-09-08 10:54:06	lohacho	Railway Trip (JOI17_railway_trip)	C++14	100 / 100	331 ms	103512 KiB

railway_trip

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#include <bits/stdc++.h>
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
using namespace std;
 
const int NS = (int)1e5 + 4, SZ = (int)3e5 + 4;
int a[NS + 4];
int seg[NS * 4 + 4];
int spa[SZ][20][2][2], dep[SZ], lcnt[SZ], pr[SZ][20];
int st[NS];
vector<int> pos[NS];
void build(int x, int s, int e){
    if(s == e){
        seg[x] = a[s];
        return;
    }
    int m = s + e >> 1;
    build(x * 2, s, m);
    build(x * 2 + 1, m + 1, e);
    seg[x] = max(seg[x * 2], seg[x * 2 + 1]);
}
 
int get(int x, int s, int e, int fs, int fe){
    if(fe < s || fs > e || fs > fe) return -1;
    if(fs <= s && fe >= e){
        return seg[x];
    }
    int m = s + e >> 1;
    return max(get(x * 2, s, m, fs, fe), get(x * 2 + 1, m + 1, e, fs, fe));
}
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 55 / 55