oj.uz

Submission #224041

# Submission time Handle Problem Language Result Execution time Memory
224041 2020-04-17T05:48:48 Z hihi Olympic Bus (JOI20_ho_t4) C++11
100 / 100
 117 ms 4352 KB 
#include <algorithm>
#include <cstdio>
#include <vector>
using namespace std;
typedef long long ll;
 
constexpr int INF = 2001001001;
constexpr int MAX_N = 200;
 
template <class T> bool chmin(T &a, T b) {
	if (b < a) {
		a = b;
		return true;
	}
	return false;
}
 
struct edge {
	int v, c, i;
	edge(int iv, int ic, int ii) {
		v = iv;
		c = ic;
		i = ii;
	}
};
 
void dijkstra(int n, const vector<edge> *e, int *w, bool *used, int s, int t) {
	int pv[n], pe[n];
	fill(w, w + n, INF);
	w[s] = 0;
	bool fin[n];
	fill(fin, fin + n, false);
	for (;;) {
		int p = -1;
		int mn = INF;
		for (int j = 0; j < n; j++) {
			if (!fin[j] && chmin(mn, w[j])) p = j;
		}
		if (p == -1) break;
		for (edge g : e[p]) {
			if (chmin(w[g.v], w[p] + g.c)) {
				pv[g.v] = p;
				pe[g.v] = g.i;
			}
		}
		fin[p] = true;
	}
	if (w[t] < INF) {
		for (; t != s; t = pv[t]) {
			used[pe[t]] = true;
		}
	}
}
 
int W[MAX_N + 1];
int dijkstra(int n, const vector<edge> *e, const vector<edge> *f, int i, int s, int t) {
	fill(W, W + n, INF);
	W[s] = 0;
	for (;;) {
		int p = -1;
		int mn = INF;
		for (int j = 0; j < n; j++) {
			if (W[j] >= 0 && chmin(mn, W[j])) p = j;
		}
		if (p == -1 || p == t) break;
		for (edge g : e[p]) {
			if (g.i == i) continue;
			chmin(W[g.v], W[p] + g.c);
		}
		W[p] = -1;
	}
	return W[t];
}
 
int main() {
	int n, m;
	scanf("%d%d", &n, &m);
	vector<edge> e[2][n];
	int u[m], v[m], c[m], d[m];
	for (int i = 0; i < m; i++) {
		scanf("%d%d%d%d", u + i, v + i, c + i, d + i);
		u[i]--;
		v[i]--;
		e[0][u[i]].push_back(edge(v[i], c[i], i));
		e[1][v[i]].push_back(edge(u[i], c[i], i));
	}
 
	bool used[2][m];
	bool dum[m];
	fill(used[0], used[2], false);
	int x[2][n], y[2][n];
	dijkstra(n, e[0], x[0], used[0], 0, n - 1);
	dijkstra(n, e[0], x[1], used[1], n - 1, 0);
	dijkstra(n, e[1], y[0], dum, n - 1, 0);
	dijkstra(n, e[1], y[1], dum, 0, n - 1);
	int w[2] = {x[0][n - 1], x[1][0]};
 
	ll ans = (ll)w[0] + w[1];
	for (int i = 0; i < m; i++) {
		ll tmp = d[i];
		for(int b = 0; b < 2; b++) {
			if(used[b][i]) {
				tmp += dijkstra(n, e[b], e[!b], i, 0, n - 1);
			} else {
				tmp += min((ll)w[b], (ll)c[i] + x[b][v[i]] + y[b][u[i]]);
			}
		}
		chmin(ans, tmp);
	}
 
	if (ans >= INF) ans = -1;
	printf("%lld\n", ans);
	return 0;
}

Compilation message

ho_t4.cpp: In function 'int main()':
ho_t4.cpp:77:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
ho_t4.cpp:81:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d", u + i, v + i, c + i, d + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 384 KB Output is correct
2 Correct 5 ms 380 KB Output is correct
3 Correct 6 ms 512 KB Output is correct
4 Correct 8 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 308 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 26 ms 384 KB Output is correct
11 Correct 20 ms 384 KB Output is correct
12 Correct 23 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 6 ms 384 KB Output is correct
15 Correct 6 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 4216 KB Output is correct
2 Correct 34 ms 4088 KB Output is correct
3 Correct 39 ms 4096 KB Output is correct
4 Correct 7 ms 512 KB Output is correct
5 Correct 6 ms 384 KB Output is correct
6 Correct 6 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 5 ms 256 KB Output is correct
9 Correct 35 ms 4064 KB Output is correct
10 Correct 45 ms 4088 KB Output is correct
11 Correct 43 ms 4216 KB Output is correct
12 Correct 35 ms 4216 KB Output is correct
13 Correct 35 ms 4216 KB Output is correct
14 Correct 36 ms 4352 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 27 ms 3072 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 32 ms 3968 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 30 ms 3960 KB Output is correct
9 Correct 31 ms 3968 KB Output is correct
10 Correct 36 ms 3968 KB Output is correct
11 Correct 35 ms 4072 KB Output is correct
12 Correct 35 ms 4088 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 4 ms 256 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 256 KB Output is correct
19 Correct 30 ms 4096 KB Output is correct
20 Correct 34 ms 4088 KB Output is correct
21 Correct 33 ms 4092 KB Output is correct
22 Correct 31 ms 3968 KB Output is correct

Subtask #4
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 384 KB Output is correct
2 Correct 5 ms 380 KB Output is correct
3 Correct 6 ms 512 KB Output is correct
4 Correct 8 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 308 KB Output is correct
7 Correct 5 ms 256 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 26 ms 384 KB Output is correct
11 Correct 20 ms 384 KB Output is correct
12 Correct 23 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 6 ms 384 KB Output is correct
15 Correct 6 ms 384 KB Output is correct
16 Correct 6 ms 384 KB Output is correct
17 Correct 32 ms 4216 KB Output is correct
18 Correct 34 ms 4088 KB Output is correct
19 Correct 39 ms 4096 KB Output is correct
20 Correct 7 ms 512 KB Output is correct
21 Correct 6 ms 384 KB Output is correct
22 Correct 6 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 256 KB Output is correct
25 Correct 35 ms 4064 KB Output is correct
26 Correct 45 ms 4088 KB Output is correct
27 Correct 43 ms 4216 KB Output is correct
28 Correct 35 ms 4216 KB Output is correct
29 Correct 35 ms 4216 KB Output is correct
30 Correct 36 ms 4352 KB Output is correct
31 Correct 6 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 27 ms 3072 KB Output is correct
34 Correct 5 ms 384 KB Output is correct
35 Correct 32 ms 3968 KB Output is correct
36 Correct 4 ms 384 KB Output is correct
37 Correct 5 ms 256 KB Output is correct
38 Correct 30 ms 3960 KB Output is correct
39 Correct 31 ms 3968 KB Output is correct
40 Correct 36 ms 3968 KB Output is correct
41 Correct 35 ms 4072 KB Output is correct
42 Correct 35 ms 4088 KB Output is correct
43 Correct 5 ms 384 KB Output is correct
44 Correct 5 ms 256 KB Output is correct
45 Correct 4 ms 256 KB Output is correct
46 Correct 5 ms 384 KB Output is correct
47 Correct 5 ms 384 KB Output is correct
48 Correct 4 ms 256 KB Output is correct
49 Correct 30 ms 4096 KB Output is correct
50 Correct 34 ms 4088 KB Output is correct
51 Correct 33 ms 4092 KB Output is correct
52 Correct 31 ms 3968 KB Output is correct
53 Correct 33 ms 4072 KB Output is correct
54 Correct 37 ms 4120 KB Output is correct
55 Correct 33 ms 4088 KB Output is correct
56 Correct 6 ms 384 KB Output is correct
57 Correct 6 ms 384 KB Output is correct
58 Correct 68 ms 3196 KB Output is correct
59 Correct 61 ms 3200 KB Output is correct
60 Correct 67 ms 3208 KB Output is correct
61 Correct 51 ms 3200 KB Output is correct
62 Correct 62 ms 3200 KB Output is correct
63 Correct 66 ms 3368 KB Output is correct
64 Correct 117 ms 3448 KB Output is correct
65 Correct 102 ms 3320 KB Output is correct
66 Correct 93 ms 3456 KB Output is correct
67 Correct 31 ms 3132 KB Output is correct
68 Correct 42 ms 4088 KB Output is correct
69 Correct 34 ms 4088 KB Output is correct
70 Correct 37 ms 4088 KB Output is correct
71 Correct 37 ms 4096 KB Output is correct
72 Correct 35 ms 4216 KB Output is correct
73 Correct 43 ms 4348 KB Output is correct
74 Correct 36 ms 4344 KB Output is correct