oj.uz

Submission #1073757

# Submission time Handle Problem Language Result Execution time Memory
1073757 2024-08-24T20:23:11 Z perekopskad Longest Trip (IOI23_longesttrip) C++17
100 / 100
 12 ms 600 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

#define el '\n'
#define ff first
#define ss second
#define pii pair <ll, ll>
#define pb push_back
#define mkp make_pair
#define fr(i, l, r) for(ll i = l; i <= r; i++)
#define debug(x) \
    { cout << #x << " = " << x << el; }

template<class T, class S>
inline bool chmax(T &a, const S &b) {
    return (a < b ? a = b, 1 : 0);
}

template<class T, class S>
inline bool chmin(T &a, const S &b) {
    return (a > b ? a = b, 1 : 0);
}

//const ll N = 2e5 + 10;
const ll M = 1e5 + 10;
const ll K = 400;
const ll INF = 1e18 + 10;
const ll inf = 1e9 + 10;
const ll LOG = 20;
const ll mod = 1000002022;
mt19937 rnd(time(0));

bool are_connected(std::vector<int> A, std::vector<int> B);

std::vector<int> longest_trip(int N, int D) {
    vector <int> f, s;
    f.pb(0); s.pb(1);

    vector <int> left;
    fr(i, 2, N - 1)
        left.pb(i);
    shuffle(left.begin(), left.end(), rnd);

    int ends = 1;
    for(int i : left) {
        if(ends == 1) {
            bool fir = are_connected({f.back()}, {i});
            bool sec = are_connected({s.back()}, {i});
            if(fir) {
                f.pb(i);
                if(!sec) ends = 0;
                else ends = 2;
            }
            else if(sec) {
                s.pb(i);
                ends = 0;
            }
            else {
                while(!s.empty()) {
                    f.pb(s.back());
                    s.pop_back();
                }
                s.pb(i);
            }
        }
        else if(ends == 0) {
            bool fir = are_connected({f.back()}, {i});
            ends = 1;
            if(fir)
                f.pb(i);
            else {
                s.pb(i);
                ends = 0;
            }
        }
        else {
            while(!s.empty()) {
                f.pb(s.back());
                s.pop_back();
            }
            s.pb(i);
            ends = 1;
        }
    }

    if(!are_connected(f, s)) {
        if(f.size() < s.size()) swap(f, s);
        return f;
    }

    vector <int> ans;
    if(f.size() == 1 && are_connected({f[0]}, {s[0], s.back()})) {
        if(are_connected({f[0]}, {s[0]})) {
            ans = f;
            for(int j : s)
                ans.pb(j);
        }
        else {
            ans = s;
            for(int j : f)
                ans.pb(j);
        }
        return ans;
    }
    else if(s.size() == 1 && are_connected({s[0]}, {f[0], f.back()})) {
        if(are_connected({f[0]}, {s[0]})) {
            ans = s;
            for(int j : f)
                ans.pb(j);
        }
        else {
            ans = f;
            for(int j : s)
                ans.pb(j);
        }
        return ans;
    }
    else if(f.size() > 1 && s.size() > 1 && are_connected({f[0], f.back()}, {s[0], s.back()})) {
        if(are_connected({f[0]}, {s[0]})) {
            reverse(f.begin(), f.end());
            ans = f;
            for(int j : s)
                ans.pb(j);
        }
        else if(are_connected({f[0]}, {s.back()})) {
            ans = s;
            for(int j : f)
                ans.pb(j);
        }
        else if(are_connected({f.back()}, {s[0]})) {
            ans = f;
            for(int j : s)
                ans.pb(j);
        }
        else {
            ans = s;
            reverse(f.begin(), f.end());
            for(int j : f)
                ans.pb(j);
        }
        return ans;
    }

    int l = 0, r = f.size() - 1;
    while(l < r) {
        int mid = (l + r) / 2;
        vector <int> v;
        for(int j = 0; j <= mid; j++)
            v.pb(f[j]);
        if(are_connected(v, s)) r = mid;
        else l = mid + 1;
    }

    int l2 = 0, r2 = s.size() - 1;
    while(l2 < r2) {
        int mid = (l2 + r2) / 2;
        vector <int> v, v2;
        for(int j = 0; j <= l; j++)
            v.pb(f[j]);
        for(int j = 0; j <= mid; j++)
            v2.pb(s[j]);
        if(are_connected(v, v2)) r2 = mid;
        else l2 = mid + 1;
    }


    for(int i = l + 1; i < f.size(); i++)
        ans.pb(f[i]);
    for(int i = 0; i <= l; i++)
        ans.pb(f[i]);
    for(int i = l2; i < s.size(); i++)
        ans.pb(s[i]);
    for(int i = 0; i < l2; i++)
        ans.pb(s[i]);

    return ans;
}

/*
static inline constexpr int maxNumberOfCalls = 32640;
static inline constexpr int maxTotalNumberOfCalls = 150000;
static inline constexpr int maxTotalNumberOfLandmarksInCalls = 1500000;
static int call_counter = 0;
static int total_call_counter = 0;
static int landmark_counter = 0;

static int C, N, D;
static std::vector<std::vector<int>> U;
static std::vector<bool> present;

static inline void protocol_violation(std::string message)
{
    printf("Protocol Violation: %s\n", message.c_str());
    exit(0);
}

bool are_connected(std::vector<int> A, std::vector<int> B)
{
    ++call_counter;
    ++total_call_counter;
    if (call_counter > maxNumberOfCalls || total_call_counter > maxTotalNumberOfCalls)
    {
        protocol_violation("too many calls");
    }

    int nA = A.size(), nB = B.size();
    landmark_counter += nA + nB;
    if (landmark_counter > maxTotalNumberOfLandmarksInCalls)
    {
        protocol_violation("too many elements");
    }

    if (nA == 0 || nB == 0)
    {
        protocol_violation("invalid array");
    }
    for (int i = 0; i < nA; ++i)
    {
        if (A[i] < 0 || N <= A[i])
        {
            protocol_violation("invalid array");
        }
        if (present[A[i]])
        {
            protocol_violation("invalid array");
        }
        present[A[i]] = true;
    }
    for (int i = 0; i < nA; ++i)
    {
        present[A[i]] = false;
    }
    for (int i = 0; i < nB; ++i)
    {
        if (B[i] < 0 || N <= B[i])
        {
            protocol_violation("invalid array");
        }
        if (present[B[i]])
        {
            protocol_violation("invalid array");
        }
        present[B[i]] = true;
    }
    for (int i = 0; i < nB; ++i)
    {
        present[B[i]] = false;
    }

    for (int i = 0; i < nA; ++i)
    {
        for (int j = 0; j < nB; ++j)
        {
            if (A[i] == B[j])
            {
                protocol_violation("non-disjoint arrays");
            }
        }
    }

    for (int i = 0; i < nA; ++i)
    {
        for (int j = 0; j < nB; ++j)
        {
            if (U[std::max(A[i], B[j])][std::min(A[i], B[j])] == 1)
            {
                return true;
            }
        }
    }

    return false;
}

int main()
{
    assert(1 == scanf("%d", &C));
    int maximumCalls = 0;
    for (int c = 0; c < C; ++c)
    {
        call_counter = 0;
        assert(2 == scanf("%d %d", &N, &D));

        present.assign(N, false);
        U.resize(N);
        for (int i = 1; i < N; ++i)
        {
            U[i].resize(i);
            for (int j = 0; j < i; ++j)
            {
                assert(1 == scanf("%d", &U[i][j]));
            }
        }

        for (int i = 2; i < N; ++i)
        {
            for (int j = 1; j < i; ++j)
            {
                for (int k = 0; k < j; ++k)
                {
                    if (U[i][j] + U[i][k] + U[j][k] < D)
                    {
                        printf("Insufficient Density\n");
                        exit(0);
                    }
                }
            }
        }

        std::vector<int> t = longest_trip(N, D);
        int l = t.size();
        //printf("%d\n", l);
        bool ok = 1;
        for (int i = 0; i < l; ++i)
        {
            if(i) {
                int a = t[i - 1], b = t[i];
                if(a > b) swap(a, b);
                if(!U[b][a]) ok = 0;
            }
            //printf(i == 0 ? "%d" : " %d", t[i]);
        }
        //printf("\n");
        if(!ok) cout << "INVALID" << el;
        //printf("%d\n", call_counter);

        maximumCalls = std::max(maximumCalls, call_counter);
        call_counter = 0;
    }
    printf("%d\n", maximumCalls);

    return 0;
}
*/

Compilation message

longesttrip.cpp: In function 'std::vector<int> longest_trip(int, int)':
longesttrip.cpp:169:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  169 |     for(int i = l + 1; i < f.size(); i++)
      |                        ~~^~~~~~~~~~
longesttrip.cpp:173:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  173 |     for(int i = l2; i < s.size(); i++)
      |                     ~~^~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 2 ms 344 KB Output is correct

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 5 ms 344 KB Output is correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 6 ms 344 KB Output is correct
9 Correct 8 ms 344 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 4 ms 512 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 6 ms 344 KB Output is correct
10 Correct 6 ms 344 KB Output is correct
11 Correct 5 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct
14 Correct 6 ms 344 KB Output is correct
15 Correct 7 ms 344 KB Output is correct
16 Correct 7 ms 344 KB Output is correct
17 Correct 8 ms 344 KB Output is correct
18 Correct 9 ms 344 KB Output is correct
19 Correct 8 ms 344 KB Output is correct
20 Correct 4 ms 344 KB Output is correct
21 Correct 6 ms 344 KB Output is correct
22 Correct 5 ms 344 KB Output is correct
23 Correct 6 ms 448 KB Output is correct
24 Correct 5 ms 344 KB Output is correct
25 Correct 6 ms 344 KB Output is correct
26 Correct 7 ms 344 KB Output is correct
27 Correct 6 ms 344 KB Output is correct
28 Correct 9 ms 344 KB Output is correct
29 Correct 5 ms 344 KB Output is correct
30 Correct 4 ms 344 KB Output is correct
31 Correct 4 ms 344 KB Output is correct
32 Correct 6 ms 344 KB Output is correct
33 Correct 5 ms 344 KB Output is correct
34 Correct 7 ms 344 KB Output is correct
35 Correct 5 ms 344 KB Output is correct
36 Correct 6 ms 596 KB Output is correct
37 Correct 8 ms 344 KB Output is correct
38 Correct 7 ms 340 KB Output is correct
39 Correct 7 ms 344 KB Output is correct
40 Correct 8 ms 344 KB Output is correct
41 Correct 7 ms 344 KB Output is correct
42 Correct 6 ms 344 KB Output is correct
43 Correct 6 ms 344 KB Output is correct
44 Correct 5 ms 344 KB Output is correct
45 Correct 11 ms 344 KB Output is correct
46 Correct 9 ms 344 KB Output is correct
47 Correct 8 ms 340 KB Output is correct
48 Correct 8 ms 344 KB Output is correct
49 Correct 7 ms 344 KB Output is correct
50 Correct 9 ms 440 KB Output is correct
51 Correct 7 ms 344 KB Output is correct
52 Correct 7 ms 344 KB Output is correct
53 Correct 6 ms 444 KB Output is correct
54 Correct 5 ms 344 KB Output is correct
55 Correct 7 ms 444 KB Output is correct
56 Correct 6 ms 344 KB Output is correct
57 Correct 10 ms 444 KB Output is correct
58 Correct 7 ms 344 KB Output is correct
59 Correct 11 ms 344 KB Output is correct
60 Correct 7 ms 344 KB Output is correct
61 Correct 7 ms 600 KB Output is correct
62 Correct 8 ms 344 KB Output is correct
63 Correct 6 ms 344 KB Output is correct
64 Correct 8 ms 448 KB Output is correct

Subtask #4
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 5 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 6 ms 344 KB Output is correct
6 Correct 10 ms 344 KB Output is correct
7 Correct 5 ms 344 KB Output is correct
8 Correct 6 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 6 ms 344 KB Output is correct
11 Correct 7 ms 344 KB Output is correct
12 Correct 5 ms 344 KB Output is correct
13 Correct 5 ms 344 KB Output is correct
14 Correct 8 ms 344 KB Output is correct
15 Correct 7 ms 344 KB Output is correct
16 Correct 9 ms 344 KB Output is correct
17 Correct 7 ms 344 KB Output is correct
18 Correct 6 ms 344 KB Output is correct
19 Correct 6 ms 344 KB Output is correct
20 Correct 6 ms 440 KB Output is correct
21 Correct 6 ms 344 KB Output is correct
22 Correct 7 ms 344 KB Output is correct
23 Correct 6 ms 344 KB Output is correct
24 Correct 6 ms 344 KB Output is correct
25 Correct 6 ms 344 KB Output is correct
26 Correct 5 ms 344 KB Output is correct
27 Correct 9 ms 344 KB Output is correct
28 Correct 7 ms 344 KB Output is correct
29 Correct 6 ms 344 KB Output is correct
30 Correct 7 ms 344 KB Output is correct
31 Correct 7 ms 344 KB Output is correct
32 Correct 8 ms 344 KB Output is correct
33 Correct 9 ms 344 KB Output is correct
34 Correct 5 ms 344 KB Output is correct
35 Correct 6 ms 344 KB Output is correct
36 Correct 8 ms 344 KB Output is correct
37 Correct 7 ms 344 KB Output is correct
38 Correct 7 ms 344 KB Output is correct
39 Correct 9 ms 344 KB Output is correct
40 Correct 5 ms 344 KB Output is correct
41 Correct 7 ms 344 KB Output is correct
42 Correct 5 ms 344 KB Output is correct
43 Correct 6 ms 444 KB Output is correct
44 Correct 5 ms 344 KB Output is correct
45 Correct 6 ms 448 KB Output is correct
46 Correct 6 ms 344 KB Output is correct
47 Correct 5 ms 344 KB Output is correct
48 Correct 7 ms 344 KB Output is correct
49 Correct 7 ms 344 KB Output is correct
50 Correct 9 ms 344 KB Output is correct
51 Correct 7 ms 344 KB Output is correct
52 Correct 7 ms 344 KB Output is correct
53 Correct 6 ms 344 KB Output is correct
54 Correct 7 ms 344 KB Output is correct
55 Correct 7 ms 344 KB Output is correct
56 Correct 6 ms 344 KB Output is correct
57 Correct 5 ms 344 KB Output is correct
58 Correct 6 ms 344 KB Output is correct
59 Correct 7 ms 344 KB Output is correct
60 Correct 7 ms 344 KB Output is correct
61 Correct 7 ms 344 KB Output is correct
62 Correct 4 ms 344 KB Output is correct
63 Correct 8 ms 344 KB Output is correct
64 Correct 7 ms 456 KB Output is correct
65 Correct 8 ms 600 KB Output is correct
66 Correct 9 ms 344 KB Output is correct
67 Correct 6 ms 344 KB Output is correct
68 Correct 6 ms 344 KB Output is correct
69 Correct 6 ms 344 KB Output is correct
70 Correct 7 ms 344 KB Output is correct
71 Correct 5 ms 344 KB Output is correct
72 Correct 11 ms 444 KB Output is correct
73 Correct 10 ms 344 KB Output is correct
74 Correct 11 ms 344 KB Output is correct
75 Correct 7 ms 448 KB Output is correct
76 Correct 7 ms 444 KB Output is correct
77 Correct 8 ms 344 KB Output is correct
78 Correct 8 ms 344 KB Output is correct
79 Correct 8 ms 344 KB Output is correct
80 Correct 7 ms 452 KB Output is correct
81 Correct 7 ms 344 KB Output is correct
82 Correct 6 ms 452 KB Output is correct