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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#665019 | #602. 最小费用最大流(随机数据) | Ecec243 | 0 | 0ms | 0kb | C++17 | 2.4kb | 2024-10-22 00:40:02 | 2024-10-22 00:40:03 |
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);
}
Details
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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...