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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#665019#602. 最小费用最大流(随机数据)Ecec2430 0ms0kbC++172.4kb2024-10-22 00:40:022024-10-22 00:40:03

Judging History

你现在查看的是最新测评结果

  • [2024-10-22 00:40:03]
  • 评测
  • 测评结果:0
  • 用时:0ms
  • 内存:0kb
  • [2024-10-22 00:40:02]
  • 提交

answer

#include <stdio.h>
#define rep(i,s,t) for (register int i = (s), i##_ = (t) + 1; i < i##_; ++ i)
#define pre(i,s,t) for (register int i = (s), i##_ = (t) - 1; i > i##_; -- i)
const int N = 505;
using ll = long long;
int n, m, s, t, t1, t2, t3, t4, tme;

int head[N], mlc = 1;
struct ep {
    int to, next;
	ll flow, cost;
} e[N << 1];
static inline void adde(int u, int v, ll fl, int cs, bool __same = false) {
    e[++ mlc] = { v, head[u], fl, cs };
    head[u] = mlc;
    e[++ mlc] = { u, head[v], (__same ? fl : 0), -cs };
    head[v] = mlc;
}

int vis[N], fa[N], fae[N];
void dfs(int u) {
	vis[u] = 1;
	for (int i = head[u], v; i; i = e[i].next) {
		if (!vis[v = e[i].to] and e[i].flow) 
			fa[v] = u, fae[v] = i, dfs(v);
	}
}

int pi[N];
int phi(int x) { 
	if (vis[x] == tme) return pi[x];
	return vis[x] = tme, pi[x] = phi(fa[x]) - e[fae[x]].cost;
}

int cyc[N];
ll cost;
#define swap(x, y) { int t = x; x = y; y = t; }
static inline void pushflow(int id) {
	int pen = e[id ^ 1].to, lca = e[id].to;
	++ tme;
	while (pen) vis[pen] = tme, pen = fa[pen];
	while (vis[lca] != tme) vis[lca] = tme, lca = fa[lca];
	int e2 = 0, f = e[id].flow, path = 2, clen = 0;
	for (int i = e[id ^ 1].to; i != lca; i = fa[i]) {
		cyc[++ clen] = fae[i];
		if (e[fae[i]].flow < f) f = e[fae[e2 = i] ^ (path = 0)].flow;
	}
	for (int i = e[id].to; i != lca; i = fa[i]) {
		cyc[++ clen] = fae[i] ^ 1;
		if (e[fae[i] ^ 1].flow < f) f = e[fae[e2 = i] ^ (path = 1)].flow;
	}
	cyc[++ clen] = id;

	rep(i,1,clen) {
		e[cyc[i]].flow -= f, e[cyc[i] ^ 1].flow += f;
		cost += 1ll * f * e[cyc[i]].cost;
	}
	if (path == 2) return;

	int lste = id ^ path, lst = e[lste].to, now = e[lste ^ 1].to;
	while (lst != e2) {
		vis[now] --;
		lste ^= 1;
		swap(lste, fae[now]);
		swap(lst, fa[now]);
		swap(lst, now);
	}
}

static inline ll simplex(int s, int t) {
	int lhead = head[s], rhead = head[t];
	adde(t, s, 1e13, -0x3f3f3f3);
	dfs(t);
	vis[t] = tme = 2, fa[t] = cost = 0;
	for (int i = 2, pre = mlc; i != pre; i = (i == mlc ? 2 : i + 1)) {
		if (e[i].flow and e[i].cost < phi(e[i ^ 1].to) - phi(e[i].to)) 
			pushflow(pre = i);
	} 
	head[s] = lhead, head[t] = rhead;
	mlc -= 2;
	return e[mlc + 2].flow;
}

signed main() {
	scanf("%d %d %d %d", &n, &m, &s, &t);
	rep(i,1,m) {
		scanf("%d %d %d %d", &t1, &t2, &t3, &t4);
		adde(t1, t2, t3, t4);
	} 
	ll flow = simplex(s, t);
	printf("%lld %lld", flow, cost + 1ll * flow * 0x3f3f3f3);
}

详细


Pretests


Final Tests

Test #1:

score: 0
Runtime Error

input:

8 27
2 3 2147483647 100
1 3 1 100
2 4 2147483647 10
1 4 1 10
2 4 2147483647 10
1 4 1 10
2 8 3 0
3 5 2147483647 100
1 5 1 100
3 8 1 0
3 2 2147483647 0
4 5 2147483647 10
1 5 1 10
4 8 1 0
4 2 2147483647 0
5 6 2147483647 1
1 6 1 1
5 6 2147483647 1
1 6 1 1
5 7 2147483647 1
1 7 1 1
5 8 3 0
5 2 2147483647 ...

output:


result:


Test #2:

score: 0
Runtime Error

input:

12 49
2 10 2147483647 5
1 10 1 5
2 5 2147483647 50
1 5 1 50
2 9 2147483647 8
1 9 1 8
2 8 2147483647 47
1 8 1 47
2 11 2147483647 17
1 11 1 17
2 12 5 0
3 12 0 0
3 2 2147483647 0
4 6 2147483647 18
1 6 1 18
4 11 2147483647 12
1 11 1 12
4 9 2147483647 14
1 9 1 14
4 12 3 0
4 2 2147483647 0
5 11 2147483647...

output:


result:


Test #3:

score: 0
Runtime Error

input:

27 169
2 15 2147483647 24
1 15 1 24
2 19 2147483647 96
1 19 1 96
2 12 2147483647 49
1 12 1 49
2 13 2147483647 75
1 13 1 75
2 24 2147483647 2
1 24 1 2
2 27 5 0
3 27 0 0
3 2 2147483647 0
4 11 2147483647 99
1 11 1 99
4 3 2147483647 85
1 3 1 85
4 27 2 0
4 2 2147483647 0
5 27 0 0
5 2 2147483647 0
6 9 214...

output:


result:


Test #4:

score: 0
Runtime Error

input:

77 2149
2 42 2147483647 33
1 42 1 33
2 68 2147483647 30
1 68 1 30
2 76 2147483647 13
1 76 1 13
2 51 2147483647 93
1 51 1 93
2 12 2147483647 39
1 12 1 39
2 57 2147483647 74
1 57 1 74
2 70 2147483647 21
1 70 1 21
2 73 2147483647 24
1 73 1 24
2 52 2147483647 54
1 52 1 54
2 15 2147483647 99
1 15 1 99
2 ...

output:


result:


Test #5:

score: 0
Runtime Error

input:

102 4199
2 48 2147483647 42
1 48 1 42
2 85 2147483647 50
1 85 1 50
2 22 2147483647 83
1 22 1 83
2 95 2147483647 97
1 95 1 97
2 82 2147483647 34
1 82 1 34
2 25 2147483647 72
1 25 1 72
2 4 2147483647 17
1 4 1 17
2 47 2147483647 10
1 47 1 10
2 71 2147483647 12
1 71 1 12
2 68 2147483647 39
1 68 1 39
2 2...

output:


result:


Test #6:

score: 0
Runtime Error

input:

102 4199
2 79 2147483647 13
1 79 1 13
2 83 2147483647 73
1 83 1 73
2 75 2147483647 90
1 75 1 90
2 30 2147483647 92
1 30 1 92
2 54 2147483647 25
1 54 1 25
2 66 2147483647 53
1 66 1 53
2 52 2147483647 37
1 52 1 37
2 63 2147483647 46
1 63 1 46
2 11 2147483647 20
1 11 1 20
2 55 2147483647 53
1 55 1 53
2...

output:


result:


Test #7:

score: 0
Runtime Error

input:

102 4199
2 39 2147483647 45
1 39 1 45
2 51 2147483647 11
1 51 1 11
2 86 2147483647 63
1 86 1 63
2 23 2147483647 46
1 23 1 46
2 48 2147483647 63
1 48 1 63
2 87 2147483647 8
1 87 1 8
2 73 2147483647 63
1 73 1 63
2 5 2147483647 52
1 5 1 52
2 80 2147483647 21
1 80 1 21
2 31 2147483647 44
1 31 1 44
2 101...

output:


result:


Test #8:

score: 0
Runtime Error

input:

302 10599
2 72 2147483647 169
1 72 1 169
2 260 2147483647 165
1 260 1 165
2 12 2147483647 108
1 12 1 108
2 16 2147483647 26
1 16 1 26
2 28 2147483647 148
1 28 1 148
2 7 2147483647 74
1 7 1 74
2 139 2147483647 199
1 139 1 199
2 231 2147483647 9
1 231 1 9
2 287 2147483647 123
1 287 1 123
2 135 2147483...

output:


result:


Test #9:

score: 0
Runtime Error

input:

302 10599
2 222 2147483647 132
1 222 1 132
2 17 2147483647 7
1 17 1 7
2 177 2147483647 253
1 177 1 253
2 90 2147483647 195
1 90 1 195
2 128 2147483647 289
1 128 1 289
2 42 2147483647 193
1 42 1 193
2 213 2147483647 133
1 213 1 133
2 263 2147483647 293
1 263 1 293
2 50 2147483647 155
1 50 1 155
2 228...

output:


result:


Test #10:

score: 0
Runtime Error

input:

302 10599
2 176 2147483647 289
1 176 1 289
2 190 2147483647 99
1 190 1 99
2 10 2147483647 96
1 10 1 96
2 240 2147483647 165
1 240 1 165
2 273 2147483647 205
1 273 1 205
2 248 2147483647 194
1 248 1 194
2 220 2147483647 122
1 220 1 122
2 194 2147483647 167
1 194 1 167
2 8 2147483647 67
1 8 1 67
2 227...

output:


result: