Submission #856759

#	Time	Username	Problem	Language	Result	Execution time	Memory
856759		vjudge1	Toll (BOI17_toll)	C++14	7 / 100	43 ms	79700 KiB

toll

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

const int INF = 1e9 + 7;
const int MAX = 50005;
int k, n, m, q;
int dp[16][MAX][5][5];
int tmp[5][5], newTmp[5][5];

bool minimize(int &x, const int &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(nullptr);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

	cin >> k >> n >> m >> q;
	for (int j = 0; (1 << j) <= n; ++j) {
        for (int i = 0; i < n; ++i) {
            for (int a = 0; a < k; ++a)
                for (int b = 0; b < k; ++b)
                    dp[j][i][a][b] = INF;
        }
	}
	while (m--) {
        int a, b, t; cin >> a >> b >> t;
        minimize(dp[0][a / k][a % k][b % k], t);
	}
	for (int j = 1; (1 << j) <= n; ++j) {
        for (int i = 0; i < n; ++i) if (i / k + (1 << j) <= (n - 1) / k) {
            int a = i / k, b = i % k;
            for (int c = 0; c < k; ++c) {
                for (int d = 0; d < k; ++d)
                    minimize(dp[j][a][b][d], dp[j - 1][a][b][c] + dp[j - 1][a + (1 << j - 1)][c][d]);
            }
        }
	}
	while (q--) {
        int a, b; cin >> a >> b; int s = a / k, t = b / k;
        for (int a = 0; a < k; ++a) {
            for (int b = 0; b < k; ++b) {
                tmp[a][b] = 0;
                newTmp[a][b] = INF;
            }
        }
        for (int j = 0, l = t - s; (1 << j) <= l; ++j) {
            if (l >> j & 1) {
                for (int a = 0; a < k; ++a) {
                    for (int b = 0; b < k; ++b) {
                        newTmp[a][b] = INF;
                    }
                }
                for (int a = 0; a < k; ++a) {
                    for (int b = 0; b < k; ++b) {
                        for (int c = 0; c < k; ++c)
                            minimize(newTmp[a][c], tmp[a][b] + dp[j][s][b][c]);
                    }
                }
                for (int a = 0; a < k; ++a) {
                    for (int b = 0; b < k; ++b)
                        tmp[a][b] = newTmp[a][b];
                }
                s += 1 << j;
            }
        }
        cout << (tmp[a % k][b % k] == INF ? -1 : tmp[a % k][b % k]) << '\n';
	}
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:44:89: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   44 |                     minimize(dp[j][a][b][d], dp[j - 1][a][b][c] + dp[j - 1][a + (1 << j - 1)][c][d]);
      |                                                                                       ~~^~~
toll.cpp:23:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:24:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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