标签:LCT rs int void luoguP2173 lct read ZJOI2012 col
链接
思路
颜色很少,开10个lct分别维护
if (Hash.count(make_pair(u, v)) && Hash[make_pair(u, v)] == col) {puts("Success.");continue;}
这一行的代码调了半天。
代码
#include <bits/stdc++.h>
#define ls c[x][0]
#define rs c[x][1]
using namespace std;
const int N = 5e4 + 7;
int read() {
int x = 0, f = 1; char s = getchar();
for (;s > '9' || s < '0'; s = getchar()) if (s == '-') f = -1;
for (;s >= '0' && s <= '9'; s = getchar()) x = x * 10 + s - '0';
return x * f;
}
map<pair<int, int>, int> Hash;
int n, m, c, k, w[N];
struct LCT {
int ru[N];
int f[N], c[N][2], ma[N], stak[N], lazy[N];
bool isroot(int x) {return c[f[x]][0] == x || c[f[x]][1] == x;}
void pushup(int x) {ma[x] = max(max(ma[ls], ma[rs]), w[x]);}
void tag(int x){swap(ls,rs), lazy[x] ^= 1;}
void pushdown(int x) {
if (lazy[x]) {
if (ls) tag(ls);
if (rs) tag(rs);
lazy[x] ^= 1;
}
}
void rotate(int x) {
int y = f[x], z = f[y], k = c[y][1] == x, w = c[x][!k];
if (isroot(y)) c[z][c[z][1] == y] = x;
c[x][!k] = y;
c[y][k] = w;
if (w) f[w] = y;
f[x] = z;
f[y] = x;
pushup(y);
}
void splay(int x) {
int y = x, z = 0;
stak[++z] = y;
while (isroot(y)) stak[++z] = y = f[y];
while (z) pushdown(stak[z--]);
while (isroot(x)) {
y = f[x], z = f[y];
if (isroot(y)) rotate((c[y][0] == x)^(c[z][0] == y) ? x : y);
rotate(x);
}
pushup(x);
}
void access(int x) {
for (int y = 0; x;x = f[y = x])
splay(x), rs = y, pushup(x);
}
void makeroot(int x) {
access(x), splay(x);
tag(x);
}
int findroot(int x) {
access(x), splay(x);
while(ls) pushdown(x), x = ls;
return x;
}
void split(int x, int y) {
makeroot(x), access(y), splay(y);
}
void link(int x, int y) {
makeroot(x);
if (findroot(y) != x) f[x] = y;
}
void cut(int x, int y) {
makeroot(x);
if (findroot(y) == x && f[x] == y && !rs) {
f[x] = c[y][0] = 0;
pushup(y);
}
}
}lct[11];
int main() {
// freopen("a.in", "r", stdin);
int n = read(), m = read(), c = read(), k = read();
for (int i = 1; i <= n; ++i) w[i] = read();
for (int i = 1; i <= m; ++i) {
int u = read(), v = read(), col = read();
Hash[make_pair(u, v)] = col;
Hash[make_pair(v, u)] = col;
lct[col].link(u, v);
lct[col].ru[u]++,lct[col].ru[v]++;
}
for (int i = 1; i <= k; ++i) {
int opt = read();
if (opt == 0) {
int x = read(), y = read();
w[x] = y;
for (int j = 0; j <= c; ++j)
lct[j].splay(x),lct[j].pushup(x);
} else if (opt == 1) {
int u = read(), v = read(), col = read();
if (Hash.count(make_pair(u, v)) && Hash[make_pair(u, v)] == col) {puts("Success.");continue;}
if (!Hash.count(make_pair(u, v))) {puts("No such edge.");continue;}
if (lct[col].ru[u] >= 2 || lct[col].ru[v] >= 2) {puts("Error 1.");continue;}
if (lct[col].findroot(u) == lct[col].findroot(v)) {puts("Error 2.");continue;}
int old_col = Hash[make_pair(u,v)];
Hash[make_pair(u, v)] = Hash[make_pair(v, u)] = col;
lct[old_col].ru[u]--, lct[old_col].ru[v]--;
lct[col].ru[u]++, lct[col].ru[v]++;
lct[old_col].cut(u, v);
lct[col].link(u, v);
puts("Success.");
} else {
int col = read(), u = read(), v = read();
if (lct[col].findroot(u) == lct[col].findroot(v)) {
lct[col].split(u, v);
printf("%d\n", lct[col].ma[v]);
} else puts("-1");
}
}
return 0;
}
标签:LCT,rs,int,void,luoguP2173,lct,read,ZJOI2012,col 来源: https://www.cnblogs.com/dsrdsr/p/10960877.html
本站声明: 1. iCode9 技术分享网(下文简称本站)提供的所有内容,仅供技术学习、探讨和分享; 2. 关于本站的所有留言、评论、转载及引用,纯属内容发起人的个人观点,与本站观点和立场无关; 3. 关于本站的所有言论和文字,纯属内容发起人的个人观点,与本站观点和立场无关; 4. 本站文章均是网友提供,不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属;如您发现该文章侵犯了您的权益,可联系我们第一时间进行删除; 5. 本站为非盈利性的个人网站,所有内容不会用来进行牟利,也不会利用任何形式的广告来间接获益,纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。