oj.uz

Submission #840763

# Submission time Handle Problem Language Result Execution time Memory
840763 2023-08-31T16:48:02 Z firewater Longest Trip (IOI23_longesttrip) C++17
100 / 100
 21 ms 2824 KB 
#include<bits/stdc++.h>
#include "longesttrip.h"
#define MX 100100
using namespace std;

int n,now,x,y,z,xx,yy,gg,zz,to[MX];
vector<int>A,B,ans,ans1,ans2,a[MX];
// queue<int>d;
// bool are_connected(std::vector<int> A, std::vector<int> B)
bool check(int x,int y)
{
    A.clear();B.clear();
    A.push_back(x);
    B.push_back(y);
    return are_connected(A,B);
}
bool checkk(int x,vector<int> G)
{
    A.clear();
    A.push_back(x);
    return are_connected(A,G);
}
bool checkkk(int x,vector<int> G)
{
    A.clear();
    for(int i=0;i<=x;++i)
        A.push_back(ans1[i]);
    return are_connected(A,G);
}
bool checkkkk(int x,int y)
{
    A.clear();
    A.push_back(x);
    B.clear();
    for(int i=0;i<=y;++i)
        B.push_back(ans2[i]);
    return are_connected(A,B);
}
void dfs(int x,int fa)
{
    ans1.push_back(x);
    for(int i=0;i<a[x].size();++i)
        if(a[x][i]!=fa)
            dfs(a[x][i],x);
    return;
}
void dfss(int x,int fa)
{
    ans2.push_back(x);
    for(int i=0;i<a[x].size();++i)
        if(a[x][i]!=fa)
            dfss(a[x][i],x);
    return;
}
mt19937 gy(2018729);
int rd(int l,int r)
{
    return gy()%(r-l+1)+l;
}
std::vector<int> longest_trip(int N, int D)
{
    n=N;
    for(int i=0;i<n;++i)
        a[i].clear();
    
    x=0;
    to[x]=x;
    y=1;
    to[y]=y;
    gg=0;
    for(int i=2;i<n;++i){
        z=i;
        to[z]=z;
        if(check(x,z)){
            a[x].push_back(z);
            a[z].push_back(x);
            xx=to[x];
            zz=to[z];
            to[xx]=zz;
            to[zz]=xx;
            x=z;
            gg=0;
        }
        else if(!gg&&check(x,y)){
            a[x].push_back(y);
            a[y].push_back(x);
            xx=to[x];
            yy=to[y];
            to[xx]=yy;
            to[yy]=xx;
            x=xx;y=z;
            gg=0;
        }
        else {
            a[y].push_back(z);
            a[z].push_back(y);
            yy=to[y];
            zz=to[z];
            to[yy]=zz;
            to[zz]=yy;
            y=z;
            gg=1;
        }
    }
    ans1.clear();
    ans2.clear();
    ans.clear();
    dfs(x,x);
    dfss(y,y);
    if(!are_connected(ans1,ans2)){
        if(ans1.size()>ans2.size())return ans1;
        else return ans2;
    }
    xx=to[x];
    yy=to[y];
    A.clear();
    B.clear();
    A.push_back(x);
    if(x!=xx)A.push_back(xx);
    B.push_back(y);
    if(y!=yy)B.push_back(yy);
    if(are_connected(A,B)){
        if(check(x,y)){
            for(int i=ans1.size()-1;i>=0;--i)
                ans.push_back(ans1[i]);
            for(int i=0;i<ans2.size();++i)
                ans.push_back(ans2[i]);
        }
        else if(check(x,yy)){
            for(int i=ans1.size()-1;i>=0;--i)
                ans.push_back(ans1[i]);
            for(int i=ans2.size()-1;i>=0;--i)
                ans.push_back(ans2[i]);
        }
        else if(check(xx,y)){
            for(int i=0;i<ans1.size();++i)
                ans.push_back(ans1[i]);
            for(int i=0;i<ans2.size();++i)
                ans.push_back(ans2[i]);
        }
        else if(check(xx,yy)){
            for(int i=0;i<ans1.size();++i)
                ans.push_back(ans1[i]);
            for(int i=ans2.size()-1;i>=0;--i)
                ans.push_back(ans2[i]);
        }
    }
    else{
        int l=0,r=ans1.size()-1;
        while(l<r){
            int mid=l+r>>1;
            if(checkkk(mid,ans2))r=mid;
            else l=mid+1;
        }
        int sav=l;
        l=0;r=ans2.size()-1;
        while(l<r){
            int mid=l+r>>1;
            if(checkkkk(ans1[sav],mid))r=mid;
            else l=mid+1;
        }
        int i=sav,j=l;
               for(int k=i+1;k<ans1.size();++k)
                    ans.push_back(ans1[k]);
               for(int k=0;k<=i;++k)
                    ans.push_back(ans1[k]);
               for(int k=j;k<ans2.size();++k)
                    ans.push_back(ans2[k]);
               for(int k=0;k<j;++k)
                    ans.push_back(ans2[k]);
            return ans;
    }
    return ans;
}

Compilation message

longesttrip.cpp: In function 'void dfs(int, int)':
longesttrip.cpp:42:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for(int i=0;i<a[x].size();++i)
      |                 ~^~~~~~~~~~~~
longesttrip.cpp: In function 'void dfss(int, int)':
longesttrip.cpp:50:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for(int i=0;i<a[x].size();++i)
      |                 ~^~~~~~~~~~~~
longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:126:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  126 |             for(int i=0;i<ans2.size();++i)
      |                         ~^~~~~~~~~~~~
longesttrip.cpp:136:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |             for(int i=0;i<ans1.size();++i)
      |                         ~^~~~~~~~~~~~
longesttrip.cpp:138:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |             for(int i=0;i<ans2.size();++i)
      |                         ~^~~~~~~~~~~~
longesttrip.cpp:142:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  142 |             for(int i=0;i<ans1.size();++i)
      |                         ~^~~~~~~~~~~~
longesttrip.cpp:151:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  151 |             int mid=l+r>>1;
      |                     ~^~
longesttrip.cpp:158:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  158 |             int mid=l+r>>1;
      |                     ~^~
longesttrip.cpp:163:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  163 |                for(int k=i+1;k<ans1.size();++k)
      |                              ~^~~~~~~~~~~~
longesttrip.cpp:167:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 |                for(int k=j;k<ans2.size();++k)
      |                            ~^~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2640 KB Output is correct
2 Correct 3 ms 2640 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 2640 KB Output is correct
2 Correct 10 ms 2640 KB Output is correct
3 Correct 9 ms 2640 KB Output is correct
4 Correct 11 ms 2640 KB Output is correct
5 Correct 11 ms 2640 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 2640 KB Output is correct
2 Correct 10 ms 2640 KB Output is correct
3 Correct 11 ms 2640 KB Output is correct
4 Correct 11 ms 2664 KB Output is correct
5 Correct 12 ms 2640 KB Output is correct
6 Correct 21 ms 2640 KB Output is correct
7 Correct 13 ms 2640 KB Output is correct
8 Correct 10 ms 2640 KB Output is correct
9 Correct 10 ms 2640 KB Output is correct
10 Correct 15 ms 2640 KB Output is correct
11 Correct 10 ms 2640 KB Output is correct
12 Correct 9 ms 2640 KB Output is correct
13 Correct 8 ms 2640 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 2640 KB Output is correct
2 Correct 8 ms 2640 KB Output is correct
3 Correct 8 ms 2640 KB Output is correct
4 Correct 11 ms 2592 KB Output is correct
5 Correct 10 ms 2640 KB Output is correct
6 Correct 20 ms 2640 KB Output is correct
7 Correct 13 ms 2640 KB Output is correct
8 Correct 11 ms 2640 KB Output is correct
9 Correct 9 ms 2640 KB Output is correct
10 Correct 11 ms 2768 KB Output is correct
11 Correct 7 ms 2640 KB Output is correct
12 Correct 8 ms 2640 KB Output is correct
13 Correct 11 ms 2640 KB Output is correct
14 Correct 7 ms 2640 KB Output is correct
15 Correct 11 ms 2640 KB Output is correct
16 Correct 16 ms 2640 KB Output is correct
17 Correct 12 ms 2640 KB Output is correct
18 Correct 13 ms 2640 KB Output is correct
19 Correct 13 ms 2672 KB Output is correct
20 Correct 10 ms 2668 KB Output is correct
21 Correct 11 ms 2784 KB Output is correct
22 Correct 11 ms 2640 KB Output is correct
23 Correct 8 ms 2640 KB Output is correct
24 Correct 10 ms 2640 KB Output is correct
25 Correct 10 ms 2640 KB Output is correct
26 Correct 8 ms 2640 KB Output is correct
27 Correct 11 ms 2640 KB Output is correct
28 Correct 11 ms 2640 KB Output is correct
29 Correct 11 ms 2640 KB Output is correct
30 Correct 11 ms 2640 KB Output is correct
31 Correct 11 ms 2640 KB Output is correct
32 Correct 9 ms 2640 KB Output is correct
33 Correct 8 ms 2640 KB Output is correct
34 Correct 8 ms 2640 KB Output is correct
35 Correct 10 ms 2640 KB Output is correct
36 Correct 9 ms 2640 KB Output is correct
37 Correct 7 ms 2640 KB Output is correct
38 Correct 10 ms 2660 KB Output is correct
39 Correct 10 ms 2640 KB Output is correct
40 Correct 9 ms 2640 KB Output is correct
41 Correct 12 ms 2640 KB Output is correct
42 Correct 8 ms 2764 KB Output is correct
43 Correct 8 ms 2640 KB Output is correct
44 Correct 12 ms 2640 KB Output is correct
45 Correct 16 ms 2640 KB Output is correct
46 Correct 10 ms 2764 KB Output is correct
47 Correct 14 ms 2640 KB Output is correct
48 Correct 9 ms 2640 KB Output is correct
49 Correct 13 ms 2640 KB Output is correct
50 Correct 8 ms 2672 KB Output is correct
51 Correct 10 ms 2640 KB Output is correct
52 Correct 13 ms 2640 KB Output is correct
53 Correct 7 ms 2672 KB Output is correct
54 Correct 11 ms 2640 KB Output is correct
55 Correct 8 ms 2640 KB Output is correct
56 Correct 9 ms 2640 KB Output is correct
57 Correct 6 ms 2824 KB Output is correct
58 Correct 11 ms 2760 KB Output is correct
59 Correct 10 ms 2640 KB Output is correct
60 Correct 10 ms 2640 KB Output is correct
61 Correct 14 ms 2640 KB Output is correct
62 Correct 11 ms 2684 KB Output is correct
63 Correct 14 ms 2640 KB Output is correct
64 Correct 8 ms 2640 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 2640 KB Output is correct
2 Correct 7 ms 2640 KB Output is correct
3 Correct 7 ms 2640 KB Output is correct
4 Correct 8 ms 2640 KB Output is correct
5 Correct 8 ms 2640 KB Output is correct
6 Correct 19 ms 2640 KB Output is correct
7 Correct 12 ms 2640 KB Output is correct
8 Correct 6 ms 2640 KB Output is correct
9 Correct 12 ms 2640 KB Output is correct
10 Correct 7 ms 2640 KB Output is correct
11 Correct 7 ms 2640 KB Output is correct
12 Correct 8 ms 2660 KB Output is correct
13 Correct 5 ms 2640 KB Output is correct
14 Correct 8 ms 2640 KB Output is correct
15 Correct 13 ms 2640 KB Output is correct
16 Correct 10 ms 2640 KB Output is correct
17 Correct 12 ms 2544 KB Output is correct
18 Correct 7 ms 2640 KB Output is correct
19 Correct 11 ms 2640 KB Output is correct
20 Correct 9 ms 2640 KB Output is correct
21 Correct 11 ms 2640 KB Output is correct
22 Correct 9 ms 2640 KB Output is correct
23 Correct 8 ms 2640 KB Output is correct
24 Correct 7 ms 2640 KB Output is correct
25 Correct 12 ms 2640 KB Output is correct
26 Correct 10 ms 2688 KB Output is correct
27 Correct 10 ms 2640 KB Output is correct
28 Correct 14 ms 2676 KB Output is correct
29 Correct 10 ms 2640 KB Output is correct
30 Correct 10 ms 2660 KB Output is correct
31 Correct 9 ms 2640 KB Output is correct
32 Correct 19 ms 2640 KB Output is correct
33 Correct 12 ms 2640 KB Output is correct
34 Correct 7 ms 2640 KB Output is correct
35 Correct 17 ms 2640 KB Output is correct
36 Correct 11 ms 2640 KB Output is correct
37 Correct 11 ms 2640 KB Output is correct
38 Correct 16 ms 2600 KB Output is correct
39 Correct 13 ms 2640 KB Output is correct
40 Correct 12 ms 2640 KB Output is correct
41 Correct 11 ms 2640 KB Output is correct
42 Correct 14 ms 2640 KB Output is correct
43 Correct 11 ms 2640 KB Output is correct
44 Correct 9 ms 2688 KB Output is correct
45 Correct 12 ms 2668 KB Output is correct
46 Correct 10 ms 2640 KB Output is correct
47 Correct 11 ms 2640 KB Output is correct
48 Correct 12 ms 2664 KB Output is correct
49 Correct 11 ms 2640 KB Output is correct
50 Correct 13 ms 2668 KB Output is correct
51 Correct 9 ms 2640 KB Output is correct
52 Correct 13 ms 2672 KB Output is correct
53 Correct 6 ms 2640 KB Output is correct
54 Correct 9 ms 2640 KB Output is correct
55 Correct 10 ms 2640 KB Output is correct
56 Correct 8 ms 2640 KB Output is correct
57 Correct 9 ms 2640 KB Output is correct
58 Correct 13 ms 2640 KB Output is correct
59 Correct 10 ms 2680 KB Output is correct
60 Correct 12 ms 2640 KB Output is correct
61 Correct 11 ms 2640 KB Output is correct
62 Correct 12 ms 2640 KB Output is correct
63 Correct 9 ms 2672 KB Output is correct
64 Correct 9 ms 2688 KB Output is correct
65 Correct 10 ms 2668 KB Output is correct
66 Correct 14 ms 2676 KB Output is correct
67 Correct 13 ms 2768 KB Output is correct
68 Correct 10 ms 2680 KB Output is correct
69 Correct 15 ms 2672 KB Output is correct
70 Correct 14 ms 2668 KB Output is correct
71 Correct 8 ms 2640 KB Output is correct
72 Correct 10 ms 2680 KB Output is correct
73 Correct 9 ms 2692 KB Output is correct
74 Correct 9 ms 2680 KB Output is correct
75 Correct 11 ms 2672 KB Output is correct
76 Correct 8 ms 2668 KB Output is correct
77 Correct 11 ms 2640 KB Output is correct
78 Correct 12 ms 2688 KB Output is correct
79 Correct 9 ms 2640 KB Output is correct
80 Correct 14 ms 2640 KB Output is correct
81 Correct 11 ms 2668 KB Output is correct
82 Correct 11 ms 2684 KB Output is correct