Submission #320379

#	Time	Username	Problem	Language	Result	Execution time	Memory
320379		keta_tsimakuridze	Dreaming (IOI13_dreaming)	C++14	100 / 100	168 ms	17636 KiB

dreaming

#include "dreaming.h"
#include<bits/stdc++.h>
#define f first
#define s second
using namespace std;
#define MAX_N 100000

static int A[MAX_N];
static int B[MAX_N];
static int T[MAX_N];

const int N=1e5+5;
vector<pair<int,int> > V[N];
vector<int>a;
int fix[N],st[N],MxR,Mxr,mx,ans,Mx,h[N][2],R;
void dfs(int u,int p,int t){
	fix[u]=1;
	if(h[u][t]>mx) {
		mx=h[u][t]; Mx=u;
	}
	for(int i=0;i<V[u].size();i++){
		if(V[u][i].f!=p) {
			h[V[u][i].f][t]=h[u][t]+V[u][i].s;
			dfs(V[u][i].f,u,t);
		}
	}
}
void dfs1(int u,int p){
	R=min(R,max(h[u][0],h[u][1]));
	for(int i=0;i<V[u].size();i++){
		if(V[u][i].f!=p){
			dfs1(V[u][i].f,u);
		
		}
	}
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    //cout<<N
    for(int i=0;i<M;i++){
    	V[A[i]].push_back({B[i],T[i]});
    	V[B[i]].push_back({A[i],T[i]});
	}
	for(int i=0;i<N;i++){
		if(!fix[i]){
			
			mx=0;
			dfs(i,-1,0);
			mx=0; R=1e8;
		     h[Mx][0]=0;
			dfs(Mx,-1,0);//	 cout<<mx<<"_"<<R<<endl;
			ans=max(ans,mx);
			dfs(Mx,-1,1);
			dfs1(i,-1);
		a.push_back(R);
			
		}
	}
	sort(a.begin(),a.end());
	reverse(a.begin(),a.end());
	if(a.size()>=3){
	ans=max(ans,a[1]+a[2]+2*L);
	}
	 if(a.size()>=2) ans=max(ans,a[0]+a[1]+L);
	return ans;
}/*
int main() {
	int N, M, L, i;
	int res;
	cin>>N>>M>>L;
	for (i = 0; i < M; i++)
		cin>>A[i]>>B[i]>>T[i];

	int answer = travelTime(N, M, L, A, B, T);
	printf("%d\n", answer);

	return 0;
} */

Compilation message (stderr)

dreaming.cpp: In function 'void dfs(int, int, int)':
dreaming.cpp:21:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(int i=0;i<V[u].size();i++){
      |              ~^~~~~~~~~~~~
dreaming.cpp: In function 'void dfs1(int, int)':
dreaming.cpp:30:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |  for(int i=0;i<V[u].size();i++){
      |              ~^~~~~~~~~~~~
dreaming.cpp: At global scope:
dreaming.cpp:10:12: warning: 'T' defined but not used [-Wunused-variable]
   10 | static int T[MAX_N];
      |            ^
dreaming.cpp:9:12: warning: 'B' defined but not used [-Wunused-variable]
    9 | static int B[MAX_N];
      |            ^
dreaming.cpp:8:12: warning: 'A' defined but not used [-Wunused-variable]
    8 | static int A[MAX_N];
      |            ^

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