Submission #950036

#	Time	Username	Problem	Language	Result	Execution time	Memory
950036		Trisanu_Das	Toll (BOI17_toll)	C++17	100 / 100	72 ms	86864 KiB

toll

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

int k, n, m, o;
int dp[50000][17][5][5], ans[5][5], tmp[5][5];

void combine(int target[5][5], int a[5][5], int b[5][5]) {
	for (int x = 0; x < k; x++) for (int y = 0; y < k; y++) for (int z = 0; z < k; z++) target[x][y] = min(target[x][y], a[x][z] + b[z][y]);
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> k >> n >> m >> o;
	memset(dp, 0x3f, sizeof dp);
	while (m--) {
		int a, b, t;
		cin >> a >> b >> t;
		dp[a / k][0][a % k][b % k] = t;
	}
	for (int j = 1; j < 17; j++) for (int i = 0; i + (1 << j) < (n + k - 1) / k; i++) combine(dp[i][j], dp[i][j - 1], dp[i + (1 << j - 1)][j - 1]);

	while (o--) {
		int a, b;
		cin >> a >> b;
		memset(ans, 0x3f, sizeof ans);
		for (int i = 0; i < 5; i++) ans[i][i] = 0;
		for (int curr = a / k, dest = b / k, i = 16; ~i; i--) {
			if (curr + (1 << i) <= dest) {
				memset(tmp, 0x3f, sizeof tmp);
				combine(tmp, ans, dp[curr][i]);
				memcpy(ans, tmp, sizeof ans);
				curr += (1 << i);
			}
		}
		cout << (ans[a % k][b % k] == 0x3f3f3f3f ? -1 : ans[a % k][b % k]) << '\n';
	}
	return 0;
}

Compilation message (stderr)

toll.cpp: In function 'int main()':
toll.cpp:21:131: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   21 |  for (int j = 1; j < 17; j++) for (int i = 0; i + (1 << j) < (n + k - 1) / k; i++) combine(dp[i][j], dp[i][j - 1], dp[i + (1 << j - 1)][j - 1]);
      |                                                                                                                                 ~~^~~

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