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Submission #296814

# Submission time Handle Problem Language Result Execution time Memory
296814 2020-09-10T22:15:52 Z Bruteforceman Olympic Bus (JOI20_ho_t4) C++11
37 / 100
 1000 ms 163832 KB 
#include "bits/stdc++.h"
using namespace std;
long long d[222][222];
vector <int> g[222], t[222];
int l[50010], r[50010], c[50010], db[50010];
int n, m;
const long long inf = 1e16;

struct data {
	int node;
	long long dist;
	data (int node, long long dist) : node(node), dist(dist) {}
	data () {}
	bool operator < (data d) const {
		return dist > d.dist;
	}
};

vector <long long> shortest_path(int src, int del) {
	priority_queue <data> Q;
	Q.push(data(src, 0));
	vector <long long> dist (n + 1, inf);
	dist[src] = 0;
	while(!Q.empty()) {
		data u = Q.top();
		Q.pop();
		for(auto e : g[u.node]) {
			if(e == del) continue;
			int y = r[e];
			if(u.dist + c[e] < dist[y]) {
				dist[y] = u.dist + c[e];
				Q.push(data(y, dist[y]));
			} 
		} 
	} 
	return dist;
}
vector <int> path(int u, int v) {
	vector <long long> dist (n + 1, inf); 
	dist[u] = 0;
	vector <int> prev (n + 1);
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= m; j++) {
			if(dist[l[j]] + c[j] < dist[r[j]]) {
				dist[r[j]] = dist[l[j]] + c[j];
				prev[r[j]] = j;
			}
		}
	}
	vector <int> ans;
	if(dist[v] >= inf) return ans;
	while(u != v) {
		ans.push_back(prev[v]);
		v ^= l[prev[v]] ^ r[prev[v]];
	}
	return ans;
} 

bool imp[50010];
vector <long long> delpath[50010], delsrc[50010];

long long delEdge(int u, int x, int e) {
	long long opt = inf;
	for(auto i : t[x]) {
		if(i != e) {
			opt = min(opt, c[i] + d[u][l[i]]);
		}
	}
	return opt;
}

long long solve(int u, int v) {
	long long ans = d[u][v] + d[v][u];
	for(int j = 1; j <= m; j++) {
		long long p1 = delsrc[j][r[j]] + c[j] + db[j] + d[l[j]][v];
		long long p2 = delpath[j][r[j]] + c[j] + d[l[j]][u];
		p2 = min(p2, delpath[j][u]);
		ans = min(ans, p1 + p2);
	}
	return ans;
}
void build() {
	int u = 1, v = n;
	vector <int> can = path(v, u);
	memset(imp, false, sizeof imp);
	for(int i : can) imp[i] = true;
	for(int i = 1; i <= m; i++) {
		if(imp[i]) {
			delpath[i] = shortest_path(v, i);
		} else {
			delpath[i].resize(n + 1);
			for(int j = 1; j <= n; j++) {
				delpath[i][j] = d[v][j];
			}
		}
	} 
	can = path(u, v);
	memset(imp, false, sizeof imp);
	for(int i : can) imp[i] = true;
	for(int i = 1; i <= m; i++) {
		if(imp[i]) {
			delsrc[i] = shortest_path(u, i);
		} else {
			delsrc[i].resize(n + 1);
			for(int j = 1; j <= n; j++) {
				delsrc[i][j] = d[u][j];
			}
		}
	}
}

int main(int argc, char const *argv[])
{
	scanf("%d %d", &n, &m);
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= n; j++) {
			if(i != j) {
				d[i][j] = inf;
			}
		}
	}
	for(int i = 1; i <= m; i++) {
		scanf("%d %d %d %d", &l[i], &r[i], &c[i], &db[i]);
		d[l[i]][r[i]] = min(d[l[i]][r[i]], (long long) c[i]);
		g[l[i]].push_back(i);
		t[r[i]].push_back(i);
	}
	for(int k = 1; k <= n; k++) {
		for(int i = 1; i <= n; i++) {
			for(int j = 1; j <= n; j++) {
				d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
			}
		}
	}
	build();
	long long ans =  solve(1, n);
	for(int i = 1; i <= m; i++) {
		delsrc[i].swap(delpath[i]);
	}
	ans = min(ans, solve(n, 1));
	if(ans >= inf) ans = -1;
	printf("%lld\n", ans);
	return 0;
}

Compilation message

ho_t4.cpp: In function 'int main(int, const char**)':
ho_t4.cpp:114:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  114 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
ho_t4.cpp:123:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  123 |   scanf("%d %d %d %d", &l[i], &r[i], &c[i], &db[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 6272 KB Output is correct
2 Correct 12 ms 3968 KB Output is correct
3 Correct 16 ms 6352 KB Output is correct
4 Correct 16 ms 6272 KB Output is correct
5 Correct 3 ms 3328 KB Output is correct
6 Correct 12 ms 3968 KB Output is correct
7 Correct 2 ms 2816 KB Output is correct
8 Correct 2 ms 2688 KB Output is correct
9 Correct 3 ms 2816 KB Output is correct
10 Correct 35 ms 6264 KB Output is correct
11 Correct 29 ms 6264 KB Output is correct
12 Correct 32 ms 6264 KB Output is correct
13 Correct 15 ms 6272 KB Output is correct
14 Correct 15 ms 6272 KB Output is correct
15 Correct 15 ms 6272 KB Output is correct
16 Correct 15 ms 6272 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 201 ms 163576 KB Output is correct
2 Correct 206 ms 163716 KB Output is correct
3 Correct 201 ms 163832 KB Output is correct
4 Correct 19 ms 9472 KB Output is correct
5 Correct 16 ms 6272 KB Output is correct
6 Correct 16 ms 4992 KB Output is correct
7 Correct 13 ms 4352 KB Output is correct
8 Correct 2 ms 2688 KB Output is correct
9 Correct 195 ms 163784 KB Output is correct
10 Correct 192 ms 163800 KB Output is correct
11 Correct 214 ms 163808 KB Output is correct
12 Correct 203 ms 163832 KB Output is correct
13 Correct 203 ms 163832 KB Output is correct
14 Correct 206 ms 163832 KB Output is correct

Subtask #3
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 6272 KB Output is correct
2 Correct 12 ms 3968 KB Output is correct
3 Correct 153 ms 128248 KB Output is correct
4 Correct 12 ms 3968 KB Output is correct
5 Correct 191 ms 163576 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 2 ms 2688 KB Output is correct
8 Correct 196 ms 163576 KB Output is correct
9 Correct 191 ms 163516 KB Output is correct
10 Correct 192 ms 163576 KB Output is correct
11 Correct 191 ms 163512 KB Output is correct
12 Correct 195 ms 163576 KB Output is correct
13 Correct 2 ms 2688 KB Output is correct
14 Correct 2 ms 2688 KB Output is correct
15 Correct 2 ms 2688 KB Output is correct
16 Correct 2 ms 2740 KB Output is correct
17 Correct 2 ms 2688 KB Output is correct
18 Correct 2 ms 2688 KB Output is correct
19 Correct 196 ms 163552 KB Output is correct
20 Correct 194 ms 163504 KB Output is correct
21 Correct 196 ms 163576 KB Output is correct
22 Correct 218 ms 163576 KB Output is correct

Subtask #4
0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 19 ms 6272 KB Output is correct
2 Correct 12 ms 3968 KB Output is correct
3 Correct 16 ms 6352 KB Output is correct
4 Correct 16 ms 6272 KB Output is correct
5 Correct 3 ms 3328 KB Output is correct
6 Correct 12 ms 3968 KB Output is correct
7 Correct 2 ms 2816 KB Output is correct
8 Correct 2 ms 2688 KB Output is correct
9 Correct 3 ms 2816 KB Output is correct
10 Correct 35 ms 6264 KB Output is correct
11 Correct 29 ms 6264 KB Output is correct
12 Correct 32 ms 6264 KB Output is correct
13 Correct 15 ms 6272 KB Output is correct
14 Correct 15 ms 6272 KB Output is correct
15 Correct 15 ms 6272 KB Output is correct
16 Correct 15 ms 6272 KB Output is correct
17 Correct 201 ms 163576 KB Output is correct
18 Correct 206 ms 163716 KB Output is correct
19 Correct 201 ms 163832 KB Output is correct
20 Correct 19 ms 9472 KB Output is correct
21 Correct 16 ms 6272 KB Output is correct
22 Correct 16 ms 4992 KB Output is correct
23 Correct 13 ms 4352 KB Output is correct
24 Correct 2 ms 2688 KB Output is correct
25 Correct 195 ms 163784 KB Output is correct
26 Correct 192 ms 163800 KB Output is correct
27 Correct 214 ms 163808 KB Output is correct
28 Correct 203 ms 163832 KB Output is correct
29 Correct 203 ms 163832 KB Output is correct
30 Correct 206 ms 163832 KB Output is correct
31 Correct 19 ms 6272 KB Output is correct
32 Correct 12 ms 3968 KB Output is correct
33 Correct 153 ms 128248 KB Output is correct
34 Correct 12 ms 3968 KB Output is correct
35 Correct 191 ms 163576 KB Output is correct
36 Correct 2 ms 2688 KB Output is correct
37 Correct 2 ms 2688 KB Output is correct
38 Correct 196 ms 163576 KB Output is correct
39 Correct 191 ms 163516 KB Output is correct
40 Correct 192 ms 163576 KB Output is correct
41 Correct 191 ms 163512 KB Output is correct
42 Correct 195 ms 163576 KB Output is correct
43 Correct 2 ms 2688 KB Output is correct
44 Correct 2 ms 2688 KB Output is correct
45 Correct 2 ms 2688 KB Output is correct
46 Correct 2 ms 2740 KB Output is correct
47 Correct 2 ms 2688 KB Output is correct
48 Correct 2 ms 2688 KB Output is correct
49 Correct 196 ms 163552 KB Output is correct
50 Correct 194 ms 163504 KB Output is correct
51 Correct 196 ms 163576 KB Output is correct
52 Correct 218 ms 163576 KB Output is correct
53 Correct 204 ms 163712 KB Output is correct
54 Correct 203 ms 163608 KB Output is correct
55 Correct 205 ms 163576 KB Output is correct
56 Correct 15 ms 6272 KB Output is correct
57 Correct 15 ms 6272 KB Output is correct
58 Correct 385 ms 131428 KB Output is correct
59 Correct 419 ms 131576 KB Output is correct
60 Correct 442 ms 131452 KB Output is correct
61 Correct 324 ms 131480 KB Output is correct
62 Correct 385 ms 131448 KB Output is correct
63 Correct 413 ms 131472 KB Output is correct
64 Execution timed out 1093 ms 92444 KB Time limit exceeded
65 Halted 0 ms 0 KB -