Submission #841866

#	Time	Username	Problem	Language	Result	Execution time	Memory
841866		hcng	Overtaking (IOI23_overtaking)	C++17	0 / 100	1 ms	600 KiB

overtaking

#include <bits/stdc++.h>
#include "overtaking.h"
using namespace std;
 
#define long long long
 
long l, n, x, m;
vector<long> w, s;
vector<vector<long>> t, e, v, pre;

void init(int L, int N, vector<long> T, vector<int> W, int X, int M, vector<int> S) {
    
    l = L, x = X, m = M;
    s.assign(S.begin(), S.end());
    t.resize(m);
    
    for (long i = 0; i < N; i++) {
        if (W[i] > X) {
            w.push_back(W[i]);
            t[0].push_back(T[i]);
        }
    }
    n = w.size();
    w.push_back(X); t[0].push_back(0);
    assert(t[0].size() == n + 1);
    e.assign(m, vector<long>(n + 1));
    v.assign(m, vector<long>(n));
    pre.assign(m, vector<long>(n));
    
    for (long i = 1; i < m; i++) {
        t[i] = vector<long>(n + 1);
        for (long j = 0; j < n; j++) {
            v[i][j] = j;
            e[i][j] = t[i - 1][j] + w[j] * (s[i] - s[i - 1]);
        }
        sort(v[i].begin(), v[i].end(),
             [&](const long &a, const long &b) {
                 return t[i - 1][a] < t[i - 1][b];
             }
        );
        pre[i][0] = e[i][v[i][0]];
        for (long j = 1; j < n; j++) {
            pre[i][j] = max(e[i][v[i][j]], pre[i][j - 1]);
        }
        for (long j = 0; j < n; j++) {
            long L = 0, R = j - 1;
            while (L < R) {
                M = (L + R + 1) / 2;
                if (t[i - 1][v[i][M]] < t[i - 1][v[i][j]]) L = M;
                else R = M - 1;
            }
            if (t[i - 1][v[i][j]] == t[i - 1][v[i][0]]) t[i][v[i][j]] = e[i][v[i][j]];
            else t[i][v[i][j]] = max(e[i][v[i][j]], pre[i][L]);
        }
    }
}

long arrival_time(long y) {
    
    t[0][n] = y;
    
    for (long i = 1; i < m; i++) {
        e[i][n] = t[i - 1][n] + w[n] * (s[i] - s[i - 1]);
        long L = 0, R = n - 1;
        while (L < R) {
            long M = (L + R + 1) / 2;
            if (t[i - 1][v[i][M]] < t[i - 1][n]) L = M;
            else R = M - 1;
        }
        if (t[i - 1][n] <= t[i - 1][v[i][0]]) t[i][n] = e[i][n];
        else t[i][n] = max(e[i][n], pre[i][L]);
    }
    
//    for (long i = 1; i < m; i++) {
//        vector<long> v(n + 1);
//        for (long j = 0; j <= n; j++) {
//            v[j] = j;
//            e[i][j] = t[i - 1][j] + w[j] * (s[i] - s[i - 1]);
//        }
//        sort(v.begin(), v.end(),
//             [&](const long &a, const long &b) {
//                 return t[i - 1][a] < t[i - 1][b];
//             }
//        );
//        vector<long> pre(n + 1); pre[0] = e[i][v[0]];
//        for (long j = 1; j <= n; j++) {
//            pre[j] = max(e[i][v[j]], pre[j - 1]);
//        }
//        for (long j = 0; j <= n; j++) {
//            long L = 0, R = j - 1;
//            while (L < R) {
//                long M = (L + R + 1) / 2;
//                if (t[i - 1][v[M]] < t[i - 1][v[j]]) L = M;
//                else R = M - 1;
//            }
//            if (t[i - 1][v[j]] == t[i - 1][v[0]]) t[i][v[j]] = e[i][v[j]];
//            else t[i][v[j]] = max(e[i][v[j]], pre[L]);
//        }
//    }
//    
//    for (long i = 0; i <= n; i++) {
//        for (long j = 0; j < m; j++) {
//            cerr << e[j][i] << ' ' << t[j][i] << "   ";
//        }
//        cerr << endl;
//    }
    
    return t[m - 1][n];
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from overtaking.cpp:1:
overtaking.cpp: In function 'void init(int, int, std::vector<long long int>, std::vector<int>, int, int, std::vector<int>)':
overtaking.cpp:25:24: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   25 |     assert(t[0].size() == n + 1);
      |            ~~~~~~~~~~~~^~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 9
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 26
• Subtask 5: 0 / 35