USACO Fence Loops

Code

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/*
ID: wcr19961
PROG: fence6
LANG: C++11
*/
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
using namespace std;
const int inf = 0x3f3f3f3f;
const int maxn = 210;
int n, p[maxn], l[maxn];
int len[maxn][maxn], d[maxn][maxn];
struct node {
int p[9];
void read(int k, int n) {
p[0] = k;
for (int i = 1; i <= n; ++i) {
scanf("%d", &p[i]);
}
sort(p, p + n + 1);
}
bool check(const node& x) const {
for (int i = 0; i < 9; ++i) {
if (p[i] != x.p[i]) {
return false;
}
}
return true;
}
} a[maxn];
int Floyd() {
int res = inf;
for (int k = 0; k < n; ++k) {
for (int i = 0; i <= k; ++i) {
if (len[k][i] == inf) {
continue;
}
for (int j = i + 1; j <= k; ++j) {
res = min(res, d[i][j] + len[j][k] + len[k][i]);
}
}
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
}
}
}
return res;
}
int main() {
freopen("fence6.in", "r", stdin);
freopen("fence6.out", "w", stdout);
int m;
scanf("%d", &m);
for (int i = 0; i < m; ++i) {
int x, num1, num2;
scanf("%d%d%d%d", &x, &l[i], &num1, &num2);
a[i << 1].read(x, num1), a[(i << 1) + 1].read(x, num2);
}
n = m << 1;
memset(p, -1, sizeof p);
for (int i = 0; i < n; ++i) {
if (p[i] == -1) {
p[i] = i;
for (int j = i + 1; j < n; ++j) {
if (p[j] == -1 && a[i].check(a[j])) {
p[j] = p[i];
}
}
}
}
memset(d, 0x3f, sizeof d);
memset(len, 0x3f, sizeof len);
for (int i = 0; i < m; ++i) {
int u = p[i << 1], v = p[(i << 1) + 1];
d[u][v] = d[v][u] = len[u][v] = len[v][u] = l[i];
}
printf("%d\n", Floyd());
return 0;
}

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