Submission #400051

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
400051	2021-05-07 09:06:26	Joshc	Queue (CEOI06_queue)	C++11	100 / 100	283 ms	18048 KiB

queue

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#include <cstdio>
#include <vector>
#include <algorithm>
#include <map>
using namespace std;
#define pii pair<int, int>
#define f first
#define s second
map<int, int> before, after;
map<int, pii> pos;
int prv(int x) {
    return before.find(x) != before.end() ? before[x] : x-1;
}
int nxt(int x) {
    return after.find(x) != after.end() ? after[x] : x+1;
}
int main() {
    int n, a, b, cur=1, len=0;
    char c;
    scanf("%d", &n);
    while (n--) {
        scanf("%d%d", &a, &b);
        if (b == cur) cur = a;
        else if (a == cur) cur = nxt(a);
        after[prv(a)] = nxt(a);
 
 
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Compilation message (stderr)

queue.cpp: In function 'int main()':
queue.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
queue.cpp:27:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         scanf("%d%d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~
queue.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
queue.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |         scanf(" %c%d", &c, &a);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100