이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#define lg long long
const lg N = 2e5+5;
lg par[N], compSize[N];
lg get(lg src)
{
if(src == par[src]) return src;
return par[src] = get(par[src]);
}
void join(lg u, lg v)
{
u = get(u), v = get(v);
if(u == v) return;
if(compSize[u] > compSize[v]) swap(u, v);
par[u] = v;
compSize[v] += compSize[u];
return;
}
int main()
{
#ifdef CYBER
freopen("in.txt", "r", stdin);
freopen("out.txt", "w", stdout);
#endif
lg n, k;
cin >> n >> k;
for(int i = 1; i <= n; i++) par[i] = i, compSize[i] = 1;
vector<array<lg, 3>> que;
k += n-1;
while(k--)
{
char c;
cin >> c;
if(c == 'S')
{
lg u, v;
cin >> u >> v;
que.push_back({c, u, v});
}
else if(c == 'Q')
{
lg u, v;
cin >> u >> v;
que.push_back({c, u, v});
}
else{
lg u;
cin >> u;
que.push_back({c, u, 0});
}
}
reverse(que.begin(), que.end());
vector<lg> ans;
for(auto [c, a, b] : que)
{
if(c == 'S')
{
join(a, b);
}
else if(c == 'Q')
{
ans.push_back(-2+(get(a) == get(b)));
}
}
reverse(ans.begin(), ans.end());
for(auto it : ans)
{
if(it < 0)
{
cout << (it == -2 ? "yes\n" : "no\n");
}
else{
cout << it << '\n';
}
}
}
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