Submission #785900

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
785900	2023-07-17 18:18:02	canadavid1	Teleporters (IOI08_teleporters)	C++14	100 / 100	503 ms	50476 KiB

teleporters

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#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
#define all(x) begin(x),end(x)
/*
Idea:
traverse without any added
enumerate and group up unreachable regions
need only count of number of teles in each region
only 2(teleporters)+1 states, changing takes exactly one teleport => optimal 2(n+m) points
any new teleporter added can only increase region count by 2, and should ideally connect a reachable and unreachable
section together (this makes the unreachable section a "subroutine" at the other point)
*/
// adding each teleporter:
    // if both endpoints are the same group, partition the group into "inside" and "outside"
    // if enpoints are different, the ends become the same group
    // sounds like union find
// size of the path. Made smaller for debugging purposes. Should be strictly bigger than the last paths end.
#define PATHLEN 2000010
signed main()
{
    int N,M;
    cin >> N >> M;
    vector<pair<int,int>> tele(N);
    for(int i = 0; i < N; i++) cin >> tele[i].first >> tele[i].second;
 
 
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Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:54:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |     if(M <= gcs.size()-1)
      |        ~~^~~~~~~~~~~~~~~
teleporters.cpp:34:9: warning: unused variable 'c' [-Wunused-variable]
   34 |     int c = 0;
      |         ^

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
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• Subtask 20: 5 / 5