Submission #433034

#	Time	Username	Problem	Language	Result	Execution time	Memory
433034		MarcoMeijer	Shortcut (IOI16_shortcut)	C++14	71 / 100	2086 ms	2228 KiB

shortcut

#include "shortcut.h"
#include <bits/stdc++.h>
using namespace std;

// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

const ll INF = 1e18;

ll n, c;
vll l, d;

bool possible(ll dist) {
    ll minSum=0, maxSum=INF, minDif=0, maxDif=INF;

    RE(i,n) RE(j,i) {
        ll curDist = d[i] + l[i] + d[j] - l[j];
        if(curDist <= dist) continue;
        minDif = max(minDif, l[i] + d[i] - dist + c - l[j] + d[j]);
        maxDif = min(maxDif, l[i] - d[i] + dist - c - l[j] - d[j]);
        minSum = max(minSum, l[i] + d[i] - dist + c + l[j] + d[j]);
        maxSum = min(maxSum, l[i] - d[i] + dist - c + l[j] - d[j]);
    }

    REP(i,1,n) {
        ll curDif, curSum;
        int j1 = 0, j2 = 0;

        int lb=0, ub=i-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            curDif = l[i]-l[mid];
            if(curDif > maxDif) lb=mid+1;
            else ub=mid;
        }
        j1 = lb;

        lb=0, ub=i-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            curSum = l[i]+l[mid];
            if(curSum < minSum) lb=mid+1;
            else ub=mid;
        }
        j2 = lb;

        curDif = l[i]-l[j1];
        curSum = l[i]+l[j1];
        if(minDif <= curDif && curDif <= maxDif && minSum <= curSum && curSum <= maxSum)
            return true;

        curDif = l[i]-l[j2];
        curSum = l[i]+l[j2];
        if(minDif <= curDif && curDif <= maxDif && minSum <= curSum && curSum <= maxSum)
            return true;
    }
    return false;
}

ll find_shortcut(int n_, vi l_, vi d_, int c_) {
    n = n_; c=c_;
    l.pb(0);
    FOR(i,l_)
        l.pb(i);
    FOR(i,d_) d.pb(i);
    REP(i,1,n) l[i]+=l[i-1];

    ll lb=0, ub=INF;
    while(lb != ub) {
        ll mid=(lb+ub)/2;
        if(possible(mid)) ub=mid;
        else lb=mid+1;
    }

    return lb;
}

• Subtask 1: 9 / 9
• Subtask 2: 14 / 14
• Subtask 3: 8 / 8
• Subtask 4: 7 / 7
• Subtask 5: 33 / 33
• Subtask 6: 0 / 22
• Subtask 7: 0 / 4
• Subtask 8: 0 / 3