oj.uz

답안 #231630

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
231630 2020-05-14T08:16:58 Z _7_7_ Olympic Bus (JOI20_ho_t4) C++14
11 / 100
 42 ms 3704 KB 
#include <bits/stdc++.h>                                           
 
//#define int long long
//#pragma GCC optimize("Ofast")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
 
 
#define file(s) freopen(s".in","r",stdin); freopen(s".out","w",stdout);
#define forev(i, b, a) for(int i = (b); i >= (a); --i)
#define forn(i, a, b) for(int i = (a); i <= (b); ++i)
#define all(x) x.begin(), x.end()
#define sz(s) (int)s.size()
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define s second
#define f first
 
 
using namespace std;
 
 
typedef pair < long long, long long > pll;    
typedef pair < int, int > pii;
typedef unsigned long long ull;         
typedef vector < pii > vpii;
typedef vector < int > vi;
typedef long double ldb;  
typedef long long ll;  
typedef double db;                             
 
 
const int inf = 1e9, maxn = 208, mod = 1e9 + 7, N = 5e4 + 11;
const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}, block = 555;
const pii base = mp(1171, 3307), Mod = mp(1e9 + 7, 1e9 + 9);
const db eps = 1e-12, pi = 3.14159265359;
const ll INF = 1e18;

int n, m, a[N], b[N], c[N], d[N], p[maxn], Bad; 
priority_queue < pii, vpii, greater < pii > > q;
ll F[maxn][maxn], D[maxn];
vpii g[2][maxn];
bool I[N];

 
 
void Floyd () {
	for (int i = 1; i <= n; ++i)
		for (int j = 1; j <= n; ++j)	
		    if (i != j)
				F[i][j] = INF;
 
	for (int i = 1; i <= m; ++i)
		F[a[i]][b[i]] = min(F[a[i]][b[i]], (ll)c[i]);
 
	for (int k = 1; k <= n; ++k)
		for (int i = 1; i <= n; ++i)
			for (int j = 1; j <= n; ++j)
				F[i][j] = min(F[i][j], F[i][k] + F[k][j]);
 
}
 
ll Dijkstra (int s, int f, int j) {
	memset(p, -1, sizeof(p));

	for (int i = 1; i <= n; ++i)
		D[i] = INF;

	while (sz(q))
		q.pop();

	D[s] = 0;
	q.push(mp(0ll, s));
	while (sz(q)) {
		int v = q.top().f, w = q.top().s;
		if (Bad && v == f)
			return D[f];
		q.pop();

		if (w != D[v])
			continue;

		for (auto X : g[j][v]) {			
			int to = X.f, i = X.s;
			if (i != Bad && D[to] > D[v] + c[i]) {
				D[to] = D[v] + c[i];
				p[to] = i;
				q.push(mp(D[to], to));
			}
		}
	}

	if (!Bad) {
		for (int i = 1; i <= n; ++i)
			if (p[i] > -1)
				I[p[i]] = 1;
	}

	return D[f];
}
 
 
main () {
	scanf("%d%d", &n, &m);
	for (int i = 1; i <= m; ++i) {
		scanf("%d%d%d%d", &a[i], &b[i], &c[i], &d[i]);
		g[0][a[i]].pb({b[i], i});
		g[1][b[i]].pb({a[i], i});
	}
 
	Floyd();
	Dijkstra(1, n, 0);
	Dijkstra(n, 1, 0);
	Dijkstra(1, n, 1);
	Dijkstra(n, 1, 1);
 

	ll ans = min(INF, F[1][n] + F[n][1]);
	for (int i = 1; i <= m; ++i) {
		if (I[i]) {
			Bad = i;
			g[0][b[i]].pb({a[i], m + 1});
			c[m + 1] = c[i];
			ans = min(ans, Dijkstra(1, n, 0) + Dijkstra(n, 1, 0) + d[i]);
			g[0][b[i]].ppb();
		} else {
			ll d1 = min(F[1][n], F[1][b[i]] + F[a[i]][n] + c[i]);
			ll d2 = min(F[n][1], F[n][b[i]] + F[a[i]][1] + c[i]);
			ans = min(ans, d1 + d2 + d[i]);
		}
	}
 
	if (ans == INF)
		ans = -1;
	printf("%lld\n", ans);			
}

Compilation message

ho_t4.cpp:104:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:105:7: 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:107:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d", &a[i], &b[i], &c[i], &d[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 640 KB Output is correct
3 Correct 14 ms 768 KB Output is correct
4 Correct 16 ms 768 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 13 ms 768 KB Output is correct
7 Incorrect 4 ms 384 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 39 ms 3704 KB Output is correct
2 Correct 39 ms 3576 KB Output is correct
3 Correct 41 ms 3584 KB Output is correct
4 Correct 14 ms 768 KB Output is correct
5 Correct 14 ms 768 KB Output is correct
6 Correct 13 ms 768 KB Output is correct
7 Correct 20 ms 640 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 41 ms 3448 KB Output is correct
10 Correct 41 ms 3192 KB Output is correct
11 Correct 41 ms 3200 KB Output is correct
12 Correct 41 ms 3192 KB Output is correct
13 Correct 42 ms 3448 KB Output is correct
14 Correct 41 ms 3328 KB Output is correct

Subtask #3
0 / 21.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 640 KB Output is correct
3 Correct 32 ms 2816 KB Output is correct
4 Correct 13 ms 640 KB Output is correct
5 Correct 40 ms 3456 KB Output is correct
6 Incorrect 5 ms 384 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #4
0 / 63.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 768 KB Output is correct
2 Correct 13 ms 640 KB Output is correct
3 Correct 14 ms 768 KB Output is correct
4 Correct 16 ms 768 KB Output is correct
5 Correct 5 ms 512 KB Output is correct
6 Correct 13 ms 768 KB Output is correct
7 Incorrect 4 ms 384 KB Output isn't correct
8 Halted 0 ms 0 KB -