Submission #52650

#	Time	Username	Problem	Language	Result	Execution time	Memory
52650		SpaimaCarpatilor	Teleporters (IOI08_teleporters)	C++17	10 / 100	665 ms	87084 KiB

teleporters

#include<bits/stdc++.h>

using namespace std;

int N, M, nr, v[2000009], nxt[2000009], gain[2000009], ap[2000009];
const int K = 2000001;

int main ()
{
//freopen ("input", "r", stdin);
//freopen ("output", "w", stdout);

scanf ("%d %d", &N, &M);
for (int i=1; i<K; i++)
    nxt[i] = i;
nxt[K] = 1;
for (int i=1; i<=N; i++)
{
    int x, y;
    scanf ("%d %d", &x, &y);
    gain[x] = gain[y] = 1;
    swap (nxt[x], nxt[y]);
}
for (int i=1; i<=K; i++)
    if (ap[i] == 0)
    {
        int j = i, s = 0;
        while (ap[j] == 0)
            ap[j] = 1,
            s += gain[j],
            j = nxt[j];
        v[++nr] = s;
    }
sort (v + 2, v + nr + 1);
while (M > 0 && nr > 1)
    v[1] += v[nr] + 2,
    nr --, M --;
if (M > 0)
    v[1] += 2 * M - M % 2;
printf ("%d\n", v[1]);
return 0;
}

Compilation message (stderr)

teleporters.cpp: In function 'int main()':
teleporters.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf ("%d %d", &N, &M);
 ~~~~~~^~~~~~~~~~~~~~~~~
teleporters.cpp:20:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf ("%d %d", &x, &y);
     ~~~~~~^~~~~~~~~~~~~~~~~

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