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Submission #545295

# Submission time Handle Problem Language Result Execution time Memory
545295 2022-04-04T08:06:42 Z benson1029 Dreaming (IOI13_dreaming) C++14
0 / 100
 46 ms 14516 KB 
#include "dreaming.h"
#include<bits/stdc++.h>
using namespace std; 

vector< pair<int,int> > edg[100005];
int vis[100005];
int bck[100005], dis[100005];
int mxdis = -1, mxdisnode = 0;
vector<int> v;

void dfs(int x, int p, int d) {
	vis[x] = 1;
	if(d>mxdis) {
		mxdis = d; mxdisnode = x;
	}
	for(auto i:edg[x]) {
		if(i.first!=p) {
			bck[i.first] = x;
			dis[i.first] = i.second;
			dfs(i.first, x, d+i.second);
		}
	}
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    for(int i=0; i<M; i++) {
    	edg[A[i]].push_back({B[i],T[i]});
    	edg[B[i]].push_back({A[i],T[i]});
	}
	int ans = 0;
	for(int i=0; i<N; i++) {
		if(vis[i]==0) {
			mxdis = -1;
			dfs(i, -1, 0);
			mxdis = -1;
			int orig = mxdisnode;
			dfs(orig, -1, 0);
			int ptr = mxdisnode;
			int cendis = mxdis, cnt = 0;
			while(ptr != orig) {
				cnt += dis[ptr]; 
				ptr = bck[ptr];
				if(max(cnt, mxdis - cnt) < cendis) {
					cendis = max(cnt, mxdis - cnt);
				}
			}
			v.push_back(cendis);
		}
	}
	sort(v.begin(), v.end());
	reverse(v.begin(), v.end());
	ans = v[0];
	if(v.size() >= 2) {
		ans = max(ans, v[0] + v[1] + L);
	} else {
		ans = max(ans, v[0] + v[2] + L*2);
	}
	return ans;
}

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 46 ms 14516 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 46 ms 14516 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 6876 KB Output is correct
2 Incorrect 27 ms 6836 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 46 ms 14516 KB Output isn't correct
2 Halted 0 ms 0 KB -