Submission #335778

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
335778	2020-12-14 02:05:28	ChrisT	스탬프 수집 (JOI16_ho_t2)	C++17	100 / 100	5 ms	3692 KiB

2016_ho_t2

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#include <bits/stdc++.h>
using namespace std;
const int MN = 1e5 + 5;
char s[MN];
long long jo[MN], oi[MN], jj[MN], ii[MN];
int main() { 
  int n;
  scanf ("%d\n%s",&n,s+1);
  long long j = 0, o = 0, i = 0;
  for (int k = 1; k <= n; k++) {
    if (s[k] == 'J') ++j;
    else if (s[k] == 'O') o += j;
    else i += o;
    jo[k] = o; jj[k] = j;
  }
  long long tot = i, ret = i;
  j = o = i = 0;
  for (int k = n; k >= 1; k--) {
    if (s[k] == 'I') ++i;
    else if (s[k] == 'O') o += i;
    else j += o;
    oi[k] = o; ii[k] = i;
  }
  for (int k = 0; k <= n; k++) {
    ret = max({ret,tot + oi[k+1],tot + jj[k]*ii[k+1],tot+jo[k]});
  }
  printf ("%lld\n",ret);
  return 0;
}
 
 
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Compilation message (stderr)

2016_ho_t2.cpp: In function 'int main()':
2016_ho_t2.cpp:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf ("%d\n%s",&n,s+1);
      |  ~~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20
• Subtask 3: 50 / 50