oj.uz

Submission #31159

# Submission time Handle Problem Language Result Execution time Memory
31159 2017-08-12T06:05:49 Z cscandkswon Dreaming (IOI13_dreaming) C++14
18 / 100
 70 ms 11512 KB 
#include "dreaming.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN=100005;
bool vst[MAXN], chk[MAXN];
vector< pair<int, int> > edge[MAXN];
int dep[MAXN], lng[MAXN], radious;
vector<int> rad;

void dfs1(int nod){
    int i;
    vst[nod]=1, chk[nod]=1;
    for(i=0; i<edge[nod].size(); i++) if(!vst[edge[nod][i].first])
        dfs1(edge[nod][i].first);
    for(i=0; i<edge[nod].size(); i++) if(!vst[edge[nod][i].first])
        dep[nod]=max(dep[nod], dep[edge[nod][i].first]+edge[nod][i].second);
    vst[nod]=0;
}

void dfs2(int nod, int rt){
    int i, dis, mx1=0, mx2=0, idx1;
    vst[nod]=1;
    chk[nod]=1;
    for(i=0; i<edge[nod].size(); i++)if(!vst[edge[nod][i].first]){
        dis=dep[edge[nod][i].first]+edge[nod][i].second;
        if(dis>mx1)
            mx1=dis, idx1=i;
        else if(dis>mx2)
            mx2=dis;
    }
    lng[nod]=mx1+mx2;
    if(max(mx1, rt)<radious)
        radious=max(mx1, rt);
    for(i=0; i<edge[nod].size(); i++)if(!vst[edge[nod][i].first]){
        if(i==idx1)
            dfs2(edge[nod][i].first, max(rt, mx2)+edge[nod][i].second);
        else
            dfs2(edge[nod][i].first, max(rt, mx1)+edge[nod][i].second);
    }
    vst[nod]=0;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    int i, dia=0;
    for(i=0; i<M; i++){
        edge[A[i]].push_back(make_pair(B[i], T[i]));
        edge[B[i]].push_back(make_pair(A[i], T[i]));
    }
    for(i=0; i<N; i++) if(!chk[i])
        dfs1(i);
    memset(chk, 0, sizeof chk);
    for(i=0; i<N; i++) if(!chk[i]){
        radious=2e9;
        dfs2(i, 0);
        rad.push_back(radious);
    }
    sort(rad.begin(), rad.end(), greater<int>());
    for(i=0; i<N; i++) dia=max(dia, lng[i]);
    if(rad.size()==1)
        return dia;
    else if(rad.size()==2)
        return max(dia, rad[0]+rad[1]+L);
    else
        return max(dia, max(rad[0]+rad[1]+L, rad[1]+rad[2]+L*2));
}

Compilation message

dreaming.cpp: In function 'void dfs1(int)':
dreaming.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0; i<edge[nod].size(); i++) if(!vst[edge[nod][i].first])
              ~^~~~~~~~~~~~~~~~~
dreaming.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0; i<edge[nod].size(); i++) if(!vst[edge[nod][i].first])
              ~^~~~~~~~~~~~~~~~~
dreaming.cpp: In function 'void dfs2(int, int)':
dreaming.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0; i<edge[nod].size(); i++)if(!vst[edge[nod][i].first]){
              ~^~~~~~~~~~~~~~~~~
dreaming.cpp:34:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0; i<edge[nod].size(); i++)if(!vst[edge[nod][i].first]){
              ~^~~~~~~~~~~~~~~~~
dreaming.cpp:35:9: warning: 'idx1' may be used uninitialized in this function [-Wmaybe-uninitialized]
         if(i==idx1)
         ^~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 11512 KB Output is correct
2 Incorrect 66 ms 11128 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 11512 KB Output is correct
2 Incorrect 66 ms 11128 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 11512 KB Output is correct
2 Incorrect 66 ms 11128 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 6364 KB Output is correct
2 Correct 29 ms 6368 KB Output is correct
3 Correct 30 ms 6400 KB Output is correct
4 Correct 28 ms 6272 KB Output is correct
5 Correct 29 ms 6400 KB Output is correct
6 Correct 31 ms 6776 KB Output is correct
7 Correct 28 ms 6400 KB Output is correct
8 Correct 30 ms 6272 KB Output is correct
9 Correct 25 ms 6264 KB Output is correct
10 Correct 27 ms 6528 KB Output is correct
11 Correct 4 ms 2816 KB Output is correct
12 Correct 8 ms 4348 KB Output is correct
13 Correct 8 ms 4348 KB Output is correct
14 Correct 8 ms 4348 KB Output is correct
15 Correct 8 ms 4348 KB Output is correct
16 Correct 8 ms 4220 KB Output is correct
17 Correct 9 ms 3964 KB Output is correct
18 Correct 9 ms 4348 KB Output is correct
19 Correct 9 ms 4220 KB Output is correct
20 Correct 4 ms 2816 KB Output is correct
21 Correct 4 ms 2816 KB Output is correct
22 Correct 4 ms 2816 KB Output is correct
23 Correct 8 ms 4220 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 11512 KB Output is correct
2 Incorrect 66 ms 11128 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 11512 KB Output is correct
2 Incorrect 66 ms 11128 KB Output isn't correct
3 Halted 0 ms 0 KB -