Submission #23192

#	Time	Username	Problem	Language	Result	Execution time	Memory
23192		model_code	Baloni (COCI15_baloni)	C++11	100 / 100	1599 ms	96004 KiB

baloni

#include <cstdio>
#include <algorithm>
#include <cstring>
#include <set>

using namespace std;

const int MAXN = 1 << 20;

int n;

set <int> S[MAXN];
int find (int pos, int v) {
  set<int>::iterator it = S[v].lower_bound(pos);
  if (it == S[v].end()) return -1;
  return *it;
}

int v[MAXN];

int main (void){
  scanf("%d", &n);
  for (int i = 0; i < n; ++i) {
    scanf("%d", &v[i]);
    S[v[i]].insert(i);
  }

  int ans = 0;
  for (int i = 0; i < n; ++i) {
   if (S[v[i]].count(i) == 0) continue;
   int pos = i;
   ++ans;
   while (pos >= 0) {
      S[v[pos]].erase(pos);
      pos = find(pos, v[pos] - 1);
   }
  }

  printf("%d\n", ans);

  return 0;
}

Compilation message (stderr)

baloni.cpp: In function 'int main()':
baloni.cpp:22:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &n);
                  ^
baloni.cpp:24:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &v[i]);
                       ^

• Subtask 1: 100 / 100