Submission #388589

#	Time	Username	Problem	Language	Result	Execution time	Memory
388589		alishahali1382	Shortcut (IOI16_shortcut)	C++14	71 / 100	2072 ms	2240 KiB

shortcut

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, int> pli;
#define debug(x) {cerr<<#x<<"="<<x<<"\n";}
#define debug2(x, y) {cerr<<#x<<", "<<#y<<" = "<<x<<", "<<y<<"\n";}
#define pb push_back
#define all(x) x.begin(), x.end()

const ll INF=10000001000000000ll;
const int MAXN=100010;

int n, m, k;
ll L[MAXN], D[MAXN], X[MAXN], C, ans;
ll prefD[MAXN], suffD[MAXN];
ll X1, Y1, X2, Y2;
/*
void AddRect(ll x, ll y, ll xx, ll yy){
	X1=max(X1, x);
	Y1=max(Y1, y);
	X2=min(X2, xx);
	Y2=min(Y2, yy);
}*/
bool Check(ll val){
	X1=Y1=-INF;
	X2=Y2=INF;
	for (int i=1; i<=n; i++) for (int j=1; j<i; j++){
		if (D[i]+D[j]+X[i]-X[j]<=val) continue ;
		ll x=X[j], y=X[i], z=val-C-D[i]-D[j];
		X1=max(X1, X[j]+X[i]-val+C+D[i]+D[j]);
		Y1=max(Y1, X[j]-X[i]-val+C+D[i]+D[j]);
		X2=min(X2, X[j]+X[i]+val-C-D[i]-D[j]);
		Y2=min(Y2, X[j]-X[i]+val-C-D[i]-D[j]);
		// AddRect(x+y-z, x-y-z, x+y+z, x-y+z);
	}
	for (int i=1; i<=n; i++){
		ll y=X[i];
		ll l=max(X1-y, Y1+y), r=min(X2-y, Y2+y);
		int pos=lower_bound(X+1, X+n+1, l)-X;
		if (pos<=n && X[pos]<=r) return 1;
	}
	return 0;
}

ll find_shortcut(int _n, vector<int> l, vector<int> d, int _C){
	n=_n;
	C=_C;
	for (int i=1; i<n; i++) L[i]=l[i-1], X[i+1]=X[i]+L[i];
	for (int i=1; i<=n; i++) D[i]=d[i-1];

	ll dwn=-1, up=INF;
	while (up-dwn>1){
		ll mid=(dwn+up)>>1;
		if (Check(mid)) up=mid;
		else dwn=mid;
	}
	return up;
}

Compilation message (stderr)

shortcut.cpp: In function 'bool Check(ll)':
shortcut.cpp:32:6: warning: unused variable 'x' [-Wunused-variable]
   32 |   ll x=X[j], y=X[i], z=val-C-D[i]-D[j];
      |      ^
shortcut.cpp:32:14: warning: unused variable 'y' [-Wunused-variable]
   32 |   ll x=X[j], y=X[i], z=val-C-D[i]-D[j];
      |              ^
shortcut.cpp:32:22: warning: unused variable 'z' [-Wunused-variable]
   32 |   ll x=X[j], y=X[i], z=val-C-D[i]-D[j];
      |                      ^

• 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