oj.uz

답안 #472606

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
472606 2021-09-13T19:22:42 Z disastah Toll (BOI17_toll) C++17
46 / 100
 137 ms 39344 KB 
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#define ar array
using namespace std;
typedef long double ld;
typedef long long ll;
const int inf=2e9+9;
const ll linf=4e18+18;
const int N=5e4;

int k, n, m, q;
vector<ar<int,2>> g[N], rg[N];
ll dst[20][N][5]; int dst_mask[N];

void build_dst(int h, int l, int r) {
	int m=(l+r)/2;
	for (int i=m*k; i<r*k; ++i) dst_mask[i]^=(1<<h);
	for (int k0=0; k0<k; ++k0) {
		dst[h][m*k+k0][k0]=0;
		for (int i=m*k+k0-1; i>=l*k; --i) {
			dst[h][i][k0]=inf;
			for (auto &[u,t] : g[i]) {
				if (u>m*k+k0) continue;
				dst[h][i][k0]=min(dst[h][i][k0],dst[h][u][k0]+t);
			}
		}
		for (int i=m*k+k0+1; i<r*k; ++i) {
			dst[h][i][k0]=inf;
			for (auto &[u,t] : rg[i]) {
				if (u<m*k+k0) continue;
				dst[h][i][k0]=min(dst[h][i][k0],dst[h][u][k0]+t);
			}
		}
	}
	if (l+1<r) {
		build_dst(h+1,l,m);
		build_dst(h+1,m,r);
	}
}

void solve() {
	cin >> k >> n >> m >> q;
	for (int i=0; i<m; ++i) {
		int a, b, t; cin >> a >> b >> t;
		g[a].push_back({b,t});
		rg[b].push_back({a,t});
	}
	build_dst(0,0,(n+k-1)/k);
	while(q--) {
		int a, b; cin >> a >> b;
		if (a/k==b/k) {
			cout << "-1\n";
			continue;
		}
		int h=__builtin_ctz(dst_mask[a]^dst_mask[b]);
		ll ans=inf;
		for (int i=0; i<k; ++i) ans=min(ans,dst[h][a][i]+dst[h][b][i]);
		cout << (ans<inf?ans:-1) << "\n";
	}
}

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
#ifdef disastah
	cout << "Output\n\n";
#endif
	int tt=1;
//	cin >> tt;
	while (tt--) {
		solve();
		cout << "\n";
	}
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 72 ms 39344 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 3 ms 3228 KB Output is correct
6 Correct 3 ms 3244 KB Output is correct
7 Correct 3 ms 3148 KB Output is correct
8 Correct 53 ms 39248 KB Output is correct
9 Correct 54 ms 39084 KB Output is correct
10 Correct 22 ms 36160 KB Output is correct

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 105 ms 37344 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2684 KB Output is correct
7 Correct 5 ms 3276 KB Output is correct
8 Correct 6 ms 3276 KB Output is correct
9 Correct 54 ms 39236 KB Output is correct
10 Incorrect 126 ms 38356 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #3
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 3 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 3 ms 3148 KB Output is correct
7 Correct 3 ms 3148 KB Output is correct
8 Correct 5 ms 3276 KB Output is correct
9 Correct 4 ms 3148 KB Output is correct
10 Correct 50 ms 39240 KB Output is correct
11 Correct 80 ms 37248 KB Output is correct
12 Correct 127 ms 38184 KB Output is correct
13 Correct 137 ms 38700 KB Output is correct
14 Correct 110 ms 37512 KB Output is correct
15 Correct 94 ms 21848 KB Output is correct
16 Correct 73 ms 21896 KB Output is correct

Subtask #4
31.0 / 31.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 3 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 3 ms 3148 KB Output is correct
7 Correct 3 ms 3148 KB Output is correct
8 Correct 5 ms 3276 KB Output is correct
9 Correct 4 ms 3148 KB Output is correct
10 Correct 50 ms 39240 KB Output is correct
11 Correct 80 ms 37248 KB Output is correct
12 Correct 127 ms 38184 KB Output is correct
13 Correct 137 ms 38700 KB Output is correct
14 Correct 110 ms 37512 KB Output is correct
15 Correct 94 ms 21848 KB Output is correct
16 Correct 73 ms 21896 KB Output is correct
17 Correct 79 ms 37248 KB Output is correct
18 Correct 2 ms 2636 KB Output is correct
19 Correct 2 ms 2636 KB Output is correct
20 Correct 2 ms 2636 KB Output is correct
21 Correct 2 ms 2636 KB Output is correct
22 Correct 2 ms 2636 KB Output is correct
23 Correct 4 ms 3248 KB Output is correct
24 Correct 5 ms 3148 KB Output is correct
25 Correct 5 ms 3200 KB Output is correct
26 Correct 5 ms 3148 KB Output is correct
27 Correct 60 ms 39192 KB Output is correct
28 Correct 135 ms 38288 KB Output is correct
29 Correct 127 ms 38728 KB Output is correct
30 Correct 105 ms 37488 KB Output is correct

Subtask #5
0 / 44.0

# 결과 실행 시간 메모리 Grader output
1 Correct 72 ms 39344 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2636 KB Output is correct
5 Correct 3 ms 3228 KB Output is correct
6 Correct 3 ms 3244 KB Output is correct
7 Correct 3 ms 3148 KB Output is correct
8 Correct 53 ms 39248 KB Output is correct
9 Correct 54 ms 39084 KB Output is correct
10 Correct 22 ms 36160 KB Output is correct
11 Correct 105 ms 37344 KB Output is correct
12 Correct 2 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 2 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 2 ms 2684 KB Output is correct
17 Correct 5 ms 3276 KB Output is correct
18 Correct 6 ms 3276 KB Output is correct
19 Correct 54 ms 39236 KB Output is correct
20 Incorrect 126 ms 38356 KB Output isn't correct
21 Halted 0 ms 0 KB -