Submission #81478

#	Time	Username	Problem	Language	Result	Execution time	Memory
81478		farukkastamonuda	Dreaming (IOI13_dreaming)	C++14	100 / 100	118 ms	16348 KiB

dreaming

#include "dreaming.h"
#include <bits/stdc++.h>
#define fi first
#define se second
#define lo long long 
#define inf 1000000009
#define md 1000000007
#define li 100005
#define mp make_pair
#define pb push_back
using namespace std;
int vis[li], mn,M[li], M2[li], node[li], ss;
vector< pair<int, int> > v[li];
void f(int x){
	vis[x] = 1;
	int t;
	for(int i = 0;i < (int)v[x].size(); i ++){
		int go = v[x][i].fi;
		int knr = v[x][i].se;
		if(vis[go] == 1) continue;
		f(go);
		t = M[go] + knr;
		if(M[x] < t){
			M2[x] = M[x];
			M[x] = t;
			node[x] = go;
		}
		else if(M2[x] < t){
			M2[x] = t;
		}
	}
	ss = max(ss, M[x] + M2[x]);
}
void g(int x, int p, int t){
	mn = min(mn, max(M[x], t));
	for(int i = 0;i < (int)v[x].size(); i ++){
		int go = v[x][i].fi;
		int knr = v[x][i].se;
		if(go == p) continue;
		int a = max(t, node[x] == go? M2[x]:M[x]);
		g(go, x ,a + knr);
	}
}
int travelTime(int n, int m, int l, int *A, int *B, int *T){
	int t, x , xx, xxx;
	for(int i = 0;i < m; i ++){
		v[ A[i] ].pb(mp(B[i], T[i]));
		v[ B[i] ].pb(mp(A[i], T[i]));
	}
	x = - inf, xx = - inf,xxx = - inf;
	for(int i = 0; i < n; i ++){
		if(vis[i] == 1) continue;
		mn = 1e9;
		f(i);
		g(i, - 1, 0);
		if(x < mn){
			xxx = xx;
			xx = x;
			x = mn;
		}
		else if(xx < mn){
			xxx = xx;
			xx = mn;
		}
		else if(xxx < mn){
			xxx = mn;
		}
	}
	return max(ss, max(x + xx + l,xx + xxx + l + l));
}

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:45:6: warning: unused variable 't' [-Wunused-variable]
  int t, x , xx, xxx;
      ^

• Subtask 1: 14 / 14
• Subtask 2: 10 / 10
• Subtask 3: 23 / 23
• Subtask 4: 18 / 18
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23