Submission #895517

#	Time	Username	Problem	Language	Result	Execution time	Memory
895517		adkjt	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	296 ms	2660 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define ll long long
#define pii pair<int,int>
string s;
int OO[222222];
vector<int> II,JJ;
int main(){
    int n,k;
    //printf("??");
    scanf("%d %d",&n,&k);
    cin>>s;
    //printf("SS");
    for(int i=0;i<n;i++)
    {
        OO[i]=OO[i-1];
        if(s[i]=='J') JJ.push_back(i);
        else if(s[i]=='I') II.push_back(i);
        else{
            OO[i]=OO[i-1]+1;
        if(!i) OO[i]=1;
        }
        if(!i) OO[i]=0;

    }
    int ans=1e9;
    //printf("%d\n",II.size());
    //printf("YY");
    for(int itJ=0;itJ<JJ.size()-k+1;itJ++)
    {
        //printf("%d\n",JJ[itJ+k-1]);
        int itI=lower_bound(II.begin(),II.end(),JJ[itJ+k-1])-II.begin();
       // printf("%d\n",itI);
        if(itI+k-1>=II.size()) continue;
        while(OO[II[itI]]-OO[JJ[itJ+k-1]]<k) {

                //printf("YOYO\n");
                itI++;
                if(itI+k-1>=II.size())
                    break;
        }

        if(itI+k-1>=II.size()) continue;
        //printf("%d %d %d %d\n",II[itI+k-1],itI+k-1,JJ[itJ],itJ);
        ans=min(ans,II[itI+k-1]-JJ[itJ]+1-(3*k));
        //printf("%d ",ans);
    }
    if(ans>333333) printf("-1");
    else
    printf("%d",ans);
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for(int itJ=0;itJ<JJ.size()-k+1;itJ++)
      |                   ~~~^~~~~~~~~~~~~~
ho_t2.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         if(itI+k-1>=II.size()) continue;
      |            ~~~~~~~^~~~~~~~~~~
ho_t2.cpp:41:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |                 if(itI+k-1>=II.size())
      |                    ~~~~~~~^~~~~~~~~~~
ho_t2.cpp:45:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         if(itI+k-1>=II.size()) continue;
      |            ~~~~~~~^~~~~~~~~~~
ho_t2.cpp:13:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     scanf("%d %d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87