Submission #146749

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
146749	2019-08-25 21:39:57	TadijaSebez	스탬프 수집 (JOI16_ho_t2)	C++11	100 / 100	6 ms	1312 KiB

2016_ho_t2

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#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=100050;
char s[N];
ll Calc(int l, int r)
{
  ll J=0,O=0,I=0;
  for(int i=l;i<=r;i++)
  {
    if(s[i]=='J') J++;
    if(s[i]=='O') O+=J;
    if(s[i]=='I') I+=O;
  }
  return I;
}
int J[N],I[N];
int main()
{
  int n;
  scanf("%i",&n);
  scanf("%s",s+1);
  s[0]='J';s[n+1]='I';
  ll ans=max(Calc(0,n),Calc(1,n+1));
  ll tmp=Calc(1,n);
  for(int i=1;i<=n;i++) J[i]=J[i-1]+(s[i]=='J');
  for(int i=n;i>=1;i--) I[i]=I[i+1]+(s[i]=='I');
  for(int i=1;i<=n;i++) ans=max(ans,tmp+(ll)J[i]*I[i+1]);
  printf("%lld\n",ans);
  return 0;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

2016_ho_t2.cpp: In function 'int main()':
2016_ho_t2.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
2016_ho_t2.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s",s+1);
  ~~~~~^~~~~~~~~~

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