Submission #583270

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
583270	2022-06-25 07:32:22	M_W	Teleporters (IOI08_teleporters)	C++17	90 / 100	1029 ms	48028 KiB

teleporters

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#include <bits/stdc++.h>
#define ii pair<int, int>
using namespace std;
int pa[2000002], cnt[2000002]; // i * 2 = st, i * 2 + 1 = ed;
int in[1000001], out[1000001];
bool vis[2000002];
map<int, int> mp;
int findpa(int a){
  return pa[a] == a ? a : pa[a] = findpa(pa[a]);
}
void unset(int u, int v){
  cnt[findpa(v)] += cnt[findpa(u)];
  pa[findpa(u)] = findpa(v);
}
int main(){
  int N, M;
  vector<ii> v;
  scanf("%d %d", &N, &M);
  for(int i = 1; i <= N; i++){
    pa[i * 2] = i * 2; pa[i * 2 + 1] = i * 2 + 1;
    cnt[i * 2] = cnt[i * 2 + 1] = 1;
    scanf("%d %d", &in[i], &out[i]);
    v.push_back({in[i], i * 2});
    v.push_back({out[i], i * 2 + 1});
  }
  sort(v.begin(), v.end());
  for(int i = 0; i < v.size(); i++){
 
 
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Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:30:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |  for(int i = 0; i < v.size(); i++){
      |                 ~~^~~~~~~~~~
teleporters.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  scanf("%d %d", &N, &M);
      |  ~~~~~^~~~~~~~~~~~~~~~~
teleporters.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   scanf("%d %d", &in[i], &out[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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