Submission #1128881

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128881		pcheloveks	Toll (BOI17_toll)	C++17	0 / 100	3095 ms	4496 KiB

toll

#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("avx,avx2,tune=native")
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <fstream>
#include <algorithm>
#include <cstring> // Для memset

#define endl '\n'
using namespace std;

typedef long long LL;
typedef pair<LL, LL> pii;

const LL DIM = 50007;
const LL INF = 999999999999;

LL n, k, o, m;

class edge {
public:
    LL to, w;
};

vector < edge > v[DIM];

class tran {
public:
    int mat[5][5];
    void init() {
        for (int i = 0; i < k; i++) {
            for (int j = 0; j < k; j++) {
                mat[i][j] = INF;
            }
        }
    }
};

tran* solve(LL L, LL R) {
    tran* ans = new tran();
    ans->init();
    if (R - L == 1) {
        for (int i = 0; i < k; i++) {
            LL val = L * k + i;
            for (auto to : v[val]) {
                ans->mat[i][to.to - (R * k)] = to.w;
            }
        }
        return ans;
    }

    LL mid = (L + R) / 2;

    tran *m1 = solve(L, mid);
    tran *m2 = solve(mid, R);

    for (int l = 0; l < k; l++) {
        for (int r = 0; r < k; r++) {
            for (int m = 0; m < k; m++) {
                ans->mat[l][r] = min(ans->mat[l][r], m1->mat[l][m] + m2->mat[m][r]);
            }
        }
    }

    delete m1;
    delete m2;

    return ans;
}

LL a, b, res, b1, b2;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> k >> n >> m >> o;
    for (int i = 1; i <= m; i++) {
        LL a, b, t;
        cin >> a >> b >> t;
        v[a].push_back({ b, t });
    }

    vector < LL > out;

    for (int i = 1; i <= o; i++) {
        cin >> a >> b;

        b1 = a / k;
        b2 = b / k;
        if (b1 >= b2) out.push_back(-1);
        else {
            res = solve(b1, b2)->mat[a - b1 * k][b - b2 * k];
            if (res >= INF) out.push_back(-1);
            else out.push_back(res);
        }
    }
    for (auto x : out) cout << x << endl;
    return 0;
}

Compilation message (stderr)

toll.cpp: In member function 'void tran::init()':
toll.cpp:37:29: warning: overflow in conversion from 'LL' {aka 'long long int'} to 'int' changes value from '999999999999' to '-727379969' [-Woverflow]
   37 |                 mat[i][j] = INF;
      |                             ^~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44