제출 #841290

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
841290		I_love_Hoang_Yen	가장 긴 여행 (IOI23_longesttrip)	C++17	15 / 100	14 ms	464 KiB

longesttrip

#include "longesttrip.h"
#include <bits/stdc++.h>
using namespace std;

// Subtask 1: D == 3
vector<int> sub1(int n) {
    vector<int> res(n);
    std::iota(res.begin(), res.end(), 0);
    return res;
}

// Subtask 2: D == 2
bool has_edge(int u, int v) {
    return are_connected({u}, {v});
}

vector<int> sub2(int n) {
    vector<int> res {0};
    for (int i = 1; i < n; i++) {
        if (has_edge(0, i)) {
            res.push_back(i);
            break;
        }
    }

    for (int i = 1; i < n; i++) {
        if (i == res[1]) continue;

        if (has_edge(res.back(), i)) {
            res.push_back(i);
        } else {
            res.insert(res.begin(), i);
        }
    }

    return res;
}

// Subtask 3: D == 1, return path with length >= Lmax / 2
vector<int> sub3(int n) {
    // maintain 2 paths
    vector<int> p1 {0}, p2 {1};

    for (int i = 2; i < n; ++i) {
        // consider p1.back(), p2.back(), i
        // -> there's at least 1 edge

        if (has_edge(p1.back(), i)) {
            p1.push_back(i);
        } else if (has_edge(p2.back(), i)) {
            p2.push_back(i);
        } else {
            reverse(p2.begin(), p2.end());
            p1.insert(p1.end(), p2.begin(), p2.end());
            p2 = {i};
        }
    }
    if (p1.size() > p2.size()) return p1;
    return p2;
}

// Subtask 4: D == 1
vector<int> sub4(int n) {
    // Use subtask 3 to get 2 paths {{{
    vector<int> p1 {0}, p2 {1};
    for (int i = 2; i < n; ++i) {
        if (has_edge(p1.back(), i)) {
            p1.push_back(i);
        } else if (has_edge(p2.back(), i)) {
            p2.push_back(i);
        } else {
            reverse(p2.begin(), p2.end());
            p1.insert(p1.end(), p2.begin(), p2.end());
            p2 = {i};
        }
    }
    // }}}
    
    // Make p1 longer path
    if (p1.size() < p2.size()) swap(p1, p2);
    if (p2.empty()) return p1;

    // Impossible to merge 2 paths
    if (!are_connected(p1, p2)) {
        return p1;
    }
    
    // Merge 2 paths:
    // Consider: p1[0], p1.back() and p2[0] -> at least 1 edge
    if (has_edge(p1.back(), p2[0])) {
        p1.insert(p1.end(), p2.begin(), p2.end());
        return p1;
    } else if (has_edge(p1[0], p2[0])) {
        reverse(p2.begin(), p2.end());
        p2.insert(p2.end(), p1.begin(), p1.end());
        return p2;
    } else {
        // p1 is a circle. Find an edge from p2[0] to any vertex in p1
        for (int i = 0; i < n; ++i) {
            if (has_edge(p1[i], p2[0])) {
                reverse(p2.begin(), p2.end());
                p2.insert(p2.end(), p1.begin() + i, p1.end());
                p2.insert(p2.end(), p1.begin(), p1.begin() + i);
                return p2;
            }
        }
    }
}

vector<int> longest_trip(int n, int d) {
    if (d == 3) return sub1(n);
    if (d == 2) return sub2(n);
    return sub4(n);
}

컴파일 시 표준 에러 (stderr) 메시지

longesttrip.cpp: In function 'std::vector<int> sub4(int)':
longesttrip.cpp:65:22: warning: control reaches end of non-void function [-Wreturn-type]
   65 |     vector<int> p1 {0}, p2 {1};
      |                      ^

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60