oj.uz

Submission #24608

# Submission time Handle Problem Language Result Execution time Memory
24608 2017-06-10T18:10:55 Z gs14004 Shortcut (IOI16_shortcut) C++11
0 / 100
 0 ms 17648 KB 
#include "shortcut.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<lint, lint> pi;

int n, c;
lint a[1000005], b[1000005];


struct seg1{
	lint mx, smx;
	int mxf, smxf;
	void init(){
		mx = smx = -1e18;
		mxf = smxf = -1;
	}
	void upd(int x, lint v){
		if(v >= mx){
			smx = mx, smxf = mxf;
			mx = v, mxf = x;
		}
		else if(v >= smx){
			smx = v, smxf = x;
		}
	}
	lint query(int x){
		if(mxf != x) return mx;
		else return smx;
	}
}seg1;

struct seg2{
	lint mx, smx;
	int mxf, smxf;
	void init(){
		mx = smx = 1e18;
		mxf = smxf = -1;
	}
	void upd(int x, lint v){
		if(v <= mx){
			smx = mx, smxf = mxf;
			mx = v, mxf = x;
		}
		else if(v <= smx){
			smx = v, smxf = x;
		}
	}
	lint query(int x){
		if(mxf != x) return mx;
		else return smx;
	}
}seg2;

vector<pi> v, w;

bool trial(lint x){
	lint ps = -1e18, pe = 1e18, ms = -1e18, me = 1e18;
	seg1.init();
	seg2.init();
	int p = 0;
	for(int i=0; i<n; i++){
		while(p < n && w[p].first + x < v[i].first){
			seg1.upd(w[p].second + 1, a[w[p].second] + b[w[p].second]);
			seg2.upd(w[p].second + 1, -a[w[p].second] + b[w[p].second]);
			p++;
		}
		lint q1 = seg1.query(v[i].second), q2 = seg2.query(v[i].second);
		ps = max(ps, q1 - x + c + b[v[i].second] + a[v[i].second]);
		pe = min(pe, q2 + x - c + b[v[i].second] - a[v[i].second]);
		ms = max(ms, q1 - x + c - b[v[i].second] + a[v[i].second]);
		me = min(me, q2 + x - c - b[v[i].second] - a[v[i].second]);
	}
	p = 0;
	for(int i=0; i<n; i++){
		while(p < n && max(ps - b[i], b[i] - me) > b[p]) p++;
		while(p > 0 && max(ps - b[i], b[i] - me) <= b[p-1]) p--;
		while(p < n && b[p] <= min(pe - b[i], b[i] - ms)) return true;
	}
	return false;
}

long long find_shortcut(int n, std::vector<int> l, std::vector<int> d, int c)
{
	::n = n;
	::c = c;
	for(int i=0; i<n; i++){
		a[i] = d[i];
		if(i >= 1) b[i] = b[i-1] + l[i-1];
	}
	for(int i=0; i<n; i++){
		v.push_back(pi(a[i] + b[i], i));
		w.push_back(pi(-a[i] + b[i], i));
	}
	sort(v.begin(), v.end());
	sort(w.begin(), w.end());
	lint s = 0, e = 1e16;
	while(s != e){
		lint m = (s+e)/2;
		if(trial(m)) e = m;
		else s = m+1;
	}
	return s;
}

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #3
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #4
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #7
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -

Subtask #8
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 17648 KB n = 4, 80 is a correct answer
2 Correct 0 ms 17648 KB n = 9, 110 is a correct answer
3 Incorrect 0 ms 17648 KB n = 4, incorrect answer: jury 21 vs contestant 20
4 Halted 0 ms 0 KB -