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| #include <iostream>
#include <cstdio>
#include <cstring>
#include <map>
using namespace std;
typedef long long LL;
const int MAXN = 15e04 + 10;
int ances[MAXN];
int find (int p) {
return p == ances[p] ? p : ances[p] = find (ances[p]);
}
int lctanc[MAXN];
int lctfind (int p) {
return p == lctanc[p] ? p : lctanc[p] = lctfind (lctanc[p]);
}
LL realval[MAXN];
int father[MAXN]= {0};
int son[MAXN][2]= {0};
LL Sum[MAXN]= {0}, value[MAXN]= {0};
int revtag[MAXN]= {0};
int isroot (int p) {
return son[father[p]][0] != p && son[father[p]][1] != p;
}
int sonbel (int p) {
return son[father[p]][1] == p;
}
void reverse (int p) {
if (! p)
return ;
swap (son[p][0], son[p][1]);
revtag[p] ^= 1;
}
void pushup (int p) {
Sum[p] = Sum[son[p][0]] + Sum[son[p][1]] + value[p];
}
void pushdown (int p) {
if (revtag[p]) {
reverse (son[p][0]), reverse (son[p][1]);
revtag[p] = 0;
}
}
void rotate (int p) {
int fa = father[p], anc = father[fa];
int s = sonbel (p);
son[fa][s] = son[p][s ^ 1];
if (son[fa][s])
father[son[fa][s]] = fa;
if (! isroot (fa))
son[anc][sonbel (fa)] = p;
father[p] = anc;
son[p][s ^ 1] = fa, father[fa] = p;
pushup (fa), pushup (p);
}
int Stack[MAXN];
int top = 0;
void splay (int p) {
top = 0, Stack[++ top] = p;
for (int nd = p; ! isroot (nd); nd = father[nd])
Stack[++ top] = father[nd];
while (top > 0)
pushdown (Stack[top]), top --;
for (int fa = father[p]; ! isroot (p); rotate (p), fa = father[p])
if (! isroot (fa))
sonbel (p) == sonbel (fa) ? rotate (fa) : rotate (p);
}
void Access (int p) {
for (int tp = 0; p; tp = p, p = father[tp] = find (father[p]))
splay (p), son[p][1] = tp, pushup (p);
}
void Makeroot (int p) {
Access (p), splay (p), reverse (p);
}
void Split (int x, int y) {
Makeroot (x);
Access (y), splay (y);
}
void link (int x, int y) {
Makeroot (x);
father[x] = y;
int fx = lctfind (x), fy = lctfind (y);
lctanc[fx] = fy;
}
void merge (int p, int root) {
if (! p)
return ;
if (p != root)
ances[p] = root, value[root] += value[p];
merge (son[p][0], root), merge (son[p][1], root);
}
void Add (int x, int y) {
int fx = find (x), fy = find (y);
if (fx == fy)
return ;
if (lctfind (fx) != lctfind (fy)) {
link (fx, fy);
return ;
}
Split (fx, fy);
merge (fy, fy);
son[fy][0] = son[fy][1] = 0;
pushup (fy);
}
void Modify (int x, int val) {
int fx = find (x);
splay (fx);
value[fx] -= realval[x] - val, realval[x] = val;
pushup (fx);
}
LL Query (int x, int y) {
int fx = find (x), fy = find (y);
if (lctfind (fx) != lctfind (fy))
return - 1;
Split (fx, fy);
return Sum[fy];
}
int N, M;
int getnum () {
int num = 0;
char ch = getchar ();
int isneg = 0;
while (! isdigit (ch)) {
if (ch == '-')
isneg = 1;
ch = getchar ();
}
while (isdigit (ch))
num = (num << 3) + (num << 1) + ch - '0', ch = getchar ();
return isneg ? - num : num;
}
int answer[MAXN];
int cnt = 0;
int main () {
int N = getnum (), M = getnum ();
for (int i = 1; i <= N; i ++)
Sum[i] = value[i] = realval[i] = getnum (), lctanc[i] = ances[i] = i;
for (int i = 1; i <= M; i ++) {
int type = getnum ();
int x = getnum (), y = getnum ();
if (type == 1)
Add (x, y);
else if (type == 2)
Modify (x, y);
else if (type == 3)
printf ("%lld\n", Query (x, y));
}
return 0;
}
|
