Submission #1035174

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035174		vjudge1	Pipes (CEOI15_pipes)	C++98	Compilation error	0 ms	0 KiB

pipes

#pragma GCC optimize("O3,unroll-loops")    
#include <iostream>
#include <vector>
using namespace std;
 
const int N = 1e5+1;
struct dsu {
	vt<int> e(N);
	int find(int &x) { return e[x] < 0 ? x : e[x] = find(e[x]); }
	bool join(int a, int b) {
		a = find(a), b = find(b);
		if (a == b) return false;
		if (e[a] > e[b]) swap(a, b);
		e[a] += e[b]; e[b] = a;
		return true;
	}
} d1, d2;
vector<int> g[N];
int timer=0;
void dfs(int at, int par) {
	d1.e[at]=d2.e[at]=++timer;
	for(int &to:g[at]) {
		if(to == par) {
			par+=N;
			continue;
		}
		if(d2.e[to]) {
			d1.e[at]=min(d1.e[at], d2.e[to]);		
		} else {
			dfs(to, at);
			d1.e[at]=min(d1.e[at], d1.e[to]);
		}
	}
	if(par>N)par-=N;
	if(d1.e[at] == d2.e[at] and at!=par) {
		printf("%d %d\n", at, par);
	}
}
int n, m, u, v;
int main() {
	srand(time(0));
 
	scanf("%d %d", &n, &m);
	//nt u, v;
	for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=-1;
	for(int i = 0;i<m;i++) {
		scanf("%d %d", &u, &v);
		if((d1.join(u, v) || d2.join(u, v))) {
			g[u].push_back(v);
			g[v].push_back(u);
		}
	}
	for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=0;
	for(int i= 1;i<=n;i++) {
		if(!d1.e[i]) {
			dfs(i, i);
		}
	}
}

Compilation message (stderr)

pipes.cpp:8:2: error: 'vt' does not name a type
    8 |  vt<int> e(N);
      |  ^~
pipes.cpp: In member function 'int dsu::find(int&)':
pipes.cpp:9:28: error: 'e' was not declared in this scope
    9 |  int find(int &x) { return e[x] < 0 ? x : e[x] = find(e[x]); }
      |                            ^
pipes.cpp: In member function 'bool dsu::join(int, int)':
pipes.cpp:13:7: error: 'e' was not declared in this scope
   13 |   if (e[a] > e[b]) swap(a, b);
      |       ^
pipes.cpp:14:3: error: 'e' was not declared in this scope
   14 |   e[a] += e[b]; e[b] = a;
      |   ^
pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:21:5: error: 'struct dsu' has no member named 'e'
   21 |  d1.e[at]=d2.e[at]=++timer;
      |     ^
pipes.cpp:21:14: error: 'struct dsu' has no member named 'e'
   21 |  d1.e[at]=d2.e[at]=++timer;
      |              ^
pipes.cpp:27:9: error: 'struct dsu' has no member named 'e'
   27 |   if(d2.e[to]) {
      |         ^
pipes.cpp:28:7: error: 'struct dsu' has no member named 'e'
   28 |    d1.e[at]=min(d1.e[at], d2.e[to]);
      |       ^
pipes.cpp:28:20: error: 'struct dsu' has no member named 'e'
   28 |    d1.e[at]=min(d1.e[at], d2.e[to]);
      |                    ^
pipes.cpp:28:30: error: 'struct dsu' has no member named 'e'
   28 |    d1.e[at]=min(d1.e[at], d2.e[to]);
      |                              ^
pipes.cpp:31:7: error: 'struct dsu' has no member named 'e'
   31 |    d1.e[at]=min(d1.e[at], d1.e[to]);
      |       ^
pipes.cpp:31:20: error: 'struct dsu' has no member named 'e'
   31 |    d1.e[at]=min(d1.e[at], d1.e[to]);
      |                    ^
pipes.cpp:31:30: error: 'struct dsu' has no member named 'e'
   31 |    d1.e[at]=min(d1.e[at], d1.e[to]);
      |                              ^
pipes.cpp:35:8: error: 'struct dsu' has no member named 'e'
   35 |  if(d1.e[at] == d2.e[at] and at!=par) {
      |        ^
pipes.cpp:35:20: error: 'struct dsu' has no member named 'e'
   35 |  if(d1.e[at] == d2.e[at] and at!=par) {
      |                    ^
pipes.cpp: In function 'int main()':
pipes.cpp:45:27: error: 'struct dsu' has no member named 'e'
   45 |  for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=-1;
      |                           ^
pipes.cpp:45:35: error: 'struct dsu' has no member named 'e'
   45 |  for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=-1;
      |                                   ^
pipes.cpp:53:27: error: 'struct dsu' has no member named 'e'
   53 |  for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=0;
      |                           ^
pipes.cpp:53:35: error: 'struct dsu' has no member named 'e'
   53 |  for(int i = 1;i<N;i++)d1.e[i]=d2.e[i]=0;
      |                                   ^
pipes.cpp:55:10: error: 'struct dsu' has no member named 'e'
   55 |   if(!d1.e[i]) {
      |          ^
pipes.cpp:43:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
pipes.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~