86 lines
1.5 KiB
Plaintext
86 lines
1.5 KiB
Plaintext
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int quick_read(){
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int ch = getch(); int x = 0, f = 0;
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while (ch < 48 || ch > 57){
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if (ch == 45) f = 1;
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ch = getch();
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}
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while (ch >= 48 && ch <=57){
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x = x * 10 + ch - 48;
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ch = getch();
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}
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if (f) return -x;
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else return x;
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}
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int n, m;
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const int maxn = 1005;
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const int maxm = 5005;
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int to[maxm], next[maxm], head[maxn], cnt = 0;
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int que[maxn], h, tail, inq[maxn];
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void add_edge(int from, int To){
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to[cnt] = To;
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next[cnt] = head[from];
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head[from] = cnt;
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cnt = cnt + 1;
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to[cnt] = from;
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next[cnt] = head[To];
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head[To] = cnt;
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cnt = cnt + 1;
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}
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void init(){
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int i = 0;
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while (i < maxn){
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head[i] = -1;
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i = i + 1;
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}
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}
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void inqueue(int x){
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inq[x] = 1;
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tail = tail + 1;
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que[tail] = x;
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}
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int pop_queue(){
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h = h + 1;
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int res = que[h];
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return que[h];
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}
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int same(int s, int t){
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h = 0;
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tail = 0;
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inqueue(s);
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int res = 0;
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while (h < tail){
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int x = pop_queue();
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if (x == t) res = 1;
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int i = head[x];
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while (i != -1){
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if (!inq[to[i]]) inqueue(to[i]);
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i = next[i];
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}
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}
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int i = 0;
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while (i <= tail){
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inq[que[i]] = 0;
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i = i + 1;
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}
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return res;
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}
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int main(){
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n = quick_read(); m = quick_read();
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init();
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while (m){
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int ch = getch();
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while (ch != 81 && ch != 85){
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ch = getch();
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}
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if (ch == 81){ // query
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int x = quick_read(), y = quick_read();
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putint(same(x, y));
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putch(10);
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}else{ // union
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int x = quick_read(), y = quick_read();
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add_edge(x, y);
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}
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m = m - 1;
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}
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return 0;
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}
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