Submission #241217

#	Time	Username	Problem	Language	Result	Execution time	Memory
241217		osaaateiasavtnl	Long Distance Coach (JOI17_coach)	C++17	71 / 100	2091 ms	32120 KiB

coach

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcountll
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC

const int N = 2007;
int l[N][N];

signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    int x, n, m, w, t;
    cin >> x >> n >> m >> w >> t;
 
    //first - d, second - c
 
    vector <int> s(n);
    for (int i = 0; i < n; ++i) 
        cin >> s[i];
    sort(all(s));
    s.app(x);
 
    vector <ii> a(m);
    for (int i = 0; i < m; ++i) 
        cin >> a[i].f >> a[i].s;
 
    sort(all(a));
    reverse(all(a));
    a.insert(a.begin(), mp(0, 0));
 
    auto getcnt = [&](int x, int d) {
        //d + k * t <= x
        //k * t <= x - d
 
        if (x < d)
            return 0ll;
 
        int k = (x-d)/t;
        return k + 1;
    };  
    auto get = [&](int i, int j) {
        int di = a[i].f;
        int dj = a[j%a.size()].f;
        if (l[i][j] != -1) {
            int p = l[i][j];
            if (getcnt(s[p], dj) > getcnt(s[p], di) || (getcnt(s[p], dj) == getcnt(s[p], di) && dj > di)) {
                return a[j].s + (getcnt(s[p], dj)-1)*w;
            }
        }
        return -1ll;
    };
    auto save = [&](int i) {
        if (i == a.size())
            return 0ll;
        int cnt = x/t+(a[i].f<=(x%t));
        return cnt * w;
    };
 
    vector <int> last(s.size()), mem(a.size(), s.size());
    for (int i = 0; i < s.size(); ++i) {
        last[i] = 0;
        for (int j = 1; j < a.size(); ++j) {
            if (getcnt(s[i], a[j].f) > getcnt(s[i], a[last[i]].f) || (getcnt(s[i], a[j].f) == getcnt(s[i], a[last[i]].f) && a[j].f > a[last[i]].f)) {
                last[i] = j;
            }   
        }   
        mem[last[i]] = min(mem[last[i]], i);
    }

    for (int i = 0; i < N; ++i) 
        for (int j = 0; j < N; ++j)
            l[i][j] = -1;

    for (int i = 0; i < a.size(); ++i) {
        for (int j = i + 1; j < a.size(); ++j) {

            int lf = l[i][j-1];
            if (mem[j] != -1) {
                if (lf == -1)
                    lf = mem[j];
                else
                    lf = min(lf, mem[j]);
            }
            l[i][j] = lf;
            
        }           
    }   

    vector <int> dp(a.size()+1, -1);
    dp[0] = (x/t+1)*w;
    for (int i = 0; i < a.size(); ++i) {
        int cur = 0;
        for (int j = i + 1; j <= a.size(); ++j) {
            if (j > i + 1) {
                int add = get(i, j - 1);
                if (add == -1)
                    break;
                cur += add;
            }   
            if (dp[j] == -1) {
                dp[j] = dp[i]+cur+save(j);
            }   
            else {
                dp[j] = min(dp[j], dp[i]+cur+save(j));
            }
        }   
    }   
    cout << (int)dp[a.size()] << endl;
}

Compilation message (stderr)

coach.cpp: In lambda function:
coach.cpp:65:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (i == a.size())
             ~~^~~~~~~~~~~
coach.cpp: In function 'int main()':
coach.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < s.size(); ++i) {
                     ~~^~~~~~~~~~
coach.cpp:74:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = 1; j < a.size(); ++j) {
                         ~~^~~~~~~~~~
coach.cpp:86:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a.size(); ++i) {
                     ~~^~~~~~~~~~
coach.cpp:87:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = i + 1; j < a.size(); ++j) {
                             ~~^~~~~~~~~~
coach.cpp:103:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < a.size(); ++i) {
                     ~~^~~~~~~~~~
coach.cpp:105:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int j = i + 1; j <= a.size(); ++j) {
                             ~~^~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 30 / 30
• Subtask 3: 25 / 25
• Subtask 4: 0 / 29