Submission #977099

#	Time	Username	Problem	Language	Result	Execution time	Memory
977099		dubabuba	Bridges (APIO19_bridges)	C++14	Compilation error	0 ms	0 KiB

bridges

#include <bits/stdc++.h>
using namespace std;

const int mxn = 2e5 + 10;
int par[mxn], ans[mxn], n, m;
vector<pair<int, pii>> edges;

int parent(int u) {
	if(par[u] < 0) return u;
	return par[u] = parent(par[u]);
}

bool unite(int u, int v) {
	u = parent(u);
	v = parent(v);
	if(u == v) return 0;

	if(par[u] > par[v]) swap(u, v);
	par[u] += par[v];
	par[v] = u;
	return 0;
}

int main() {
	cin >> n >> m;
	for(int i = 0; i < m; i++) {
		int u, v, w;
		cin >> u >> v >> w;
		edges.push_back(MP(-w, MP(u, v)));
	}

	cin >> q;
	for(int i = 1; i <= q; i++) {
		int s, w;
		cin >> s >> w;
		edges.push_back(MP(-w, MP(-i, s)));
	}

	sort(edges.begin(), edges.end());
	memset(par, -1, sizeof par);

	for(auto p : edges) {
		if(p.ss.ff > 0) {
			int w = p.ff;
			int u = p.ss.ff;
			int v = p.ss.ss;
			unite(u, v);
		}
		else {
			int w = p.ff;
			int i = -p.ss.ff;
			int s = p.ss.ss;
			ans[i] = par[parent(s)];
		}
	}

	for(int i = 1; i <= q; i++)
		cout << ans[i] << endl;
	return 0;
}

Compilation message (stderr)

bridges.cpp:6:18: error: 'pii' was not declared in this scope
    6 | vector<pair<int, pii>> edges;
      |                  ^~~
bridges.cpp:6:18: error: template argument 2 is invalid
bridges.cpp:6:21: error: template argument 1 is invalid
    6 | vector<pair<int, pii>> edges;
      |                     ^~
bridges.cpp:6:21: error: template argument 2 is invalid
bridges.cpp: In function 'int main()':
bridges.cpp:29:9: error: request for member 'push_back' in 'edges', which is of non-class type 'int'
   29 |   edges.push_back(MP(-w, MP(u, v)));
      |         ^~~~~~~~~
bridges.cpp:29:26: error: 'MP' was not declared in this scope
   29 |   edges.push_back(MP(-w, MP(u, v)));
      |                          ^~
bridges.cpp:29:19: error: 'MP' was not declared in this scope
   29 |   edges.push_back(MP(-w, MP(u, v)));
      |                   ^~
bridges.cpp:32:9: error: 'q' was not declared in this scope
   32 |  cin >> q;
      |         ^
bridges.cpp:36:9: error: request for member 'push_back' in 'edges', which is of non-class type 'int'
   36 |   edges.push_back(MP(-w, MP(-i, s)));
      |         ^~~~~~~~~
bridges.cpp:36:26: error: 'MP' was not declared in this scope
   36 |   edges.push_back(MP(-w, MP(-i, s)));
      |                          ^~
bridges.cpp:36:19: error: 'MP' was not declared in this scope
   36 |   edges.push_back(MP(-w, MP(-i, s)));
      |                   ^~
bridges.cpp:39:13: error: request for member 'begin' in 'edges', which is of non-class type 'int'
   39 |  sort(edges.begin(), edges.end());
      |             ^~~~~
bridges.cpp:39:28: error: request for member 'end' in 'edges', which is of non-class type 'int'
   39 |  sort(edges.begin(), edges.end());
      |                            ^~~
bridges.cpp:42:15: error: 'begin' was not declared in this scope; did you mean 'std::begin'?
   42 |  for(auto p : edges) {
      |               ^~~~~
      |               std::begin
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
                 from bridges.cpp:1:
/usr/include/c++/10/valarray:1224:5: note: 'std::begin' declared here
 1224 |     begin(const valarray<_Tp>& __va)
      |     ^~~~~
bridges.cpp:42:15: error: 'end' was not declared in this scope; did you mean 'std::end'?
   42 |  for(auto p : edges) {
      |               ^~~~~
      |               std::end
In file included from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:95,
                 from bridges.cpp:1:
/usr/include/c++/10/valarray:1244:5: note: 'std::end' declared here
 1244 |     end(const valarray<_Tp>& __va)
      |     ^~~
bridges.cpp:44:8: warning: unused variable 'w' [-Wunused-variable]
   44 |    int w = p.ff;
      |        ^
bridges.cpp:50:8: warning: unused variable 'w' [-Wunused-variable]
   50 |    int w = p.ff;
      |        ^