Submission #524933

#	Time	Username	Problem	Language	Result	Execution time	Memory
524933		Carmel_Ab1	JJOOII 2 (JOI20_ho_t2)	C++17	0 / 100	1 ms	204 KiB

ho_t2

/*
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
 */
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define outfl(x){cout << x << endl;return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p){is >> p.first >> p.second;return is;}
template<typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1, T2>& p){os <<"" << p.first << " " << p.second << ""; return os;}
void usaco(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T>& v){
    int n=v.size();
    for(int i=0; i<n; i++)
        cin >> v[i];
}
template<typename T>
vector<T>UNQ(vector<T>a){
    vector<T>ans;
    for(T t:a)
        if(ans.empty() || t!=ans.back())
            ans.push_back(t);
    return ans;
}



void solve();
int main(){
    GLHF;
    int t=1;
    //cin >> t;
    while(t--)
        solve();
}
bool ok(string s,int k){
    int c1=0,c2=0,c3=0;
    for(int i=0; i<s.size(); i++)
        if(c1<k && s[i]=='J')
            c1++;
        else if(c1==k && c2<k && s[i]=='O')
            c2++;
        else if(c1==k && c2==k && s[i]=='I')
            c3++;
    if(c3==k)return 1;
    else return 0;
}

void solve() {
    int n,k;
    cin >> n >> k;
    string s;
    cin >> s;

    if(!ok(s,k))out(-1)

    int lg=19;
    vvi nxto(n+1,vi(lg,-1));
    vvi nxtj(n+1,vi(lg,-1));
    vvi nxti(n+1,vi(lg,-1));

    int lsti=-1,lstj=-1,lsto=-1;
    for(int i=n-1;0<=i; i--){
        nxto[i][0]=lsto;
        nxti[i][0]=lsti;
        nxtj[i][0]=lstj;
        if(s[i]=='O')
            lsto=i;
        else if(s[i]=='J')
            lstj=i;
        else
            lsti=i;
    }

    for(int j=1; j<lg; j++){
        for(int i=0; i<n; i++) {
            if(nxto[i][j-1]!=-1)
                nxto[i][j] = nxto[nxto[i][j - 1]][j - 1];
            if(nxti[i][j-1]!=-1)
                nxti[i][j] = nxti[nxti[i][j - 1]][j - 1];
            if(nxtj[i][j-1]!=-1)
                nxtj[i][j] = nxtj[nxtj[i][j - 1]][j - 1];
        }
    }

    int ans=n;

    for(int i=0; i<n; i++){
        if(s[i]!='J')continue;

        int j=i;
        for(int b=0; b<lg; b++)
            if((k-1)&(1<<b) && j!=-1)
                j=nxtj[j][b];
        if(j==-1)continue;
        j=nxto[j][0];
        for(int b=0; b<lg; b++)
            if((k-1)&(1<<b) && j!=-1)
                j=nxto[j][b];
        if(j==-1)continue;

        j=nxti[j][0];
        for(int b=0; b<lg; b++)
            if((k-1)&(1<<b) && j!=-1)
                j=nxti[j][b];
        if(j==-1)continue;
        ans=min(ans,j-i-3*k+1);
    }
    out(ans)
}

Compilation message (stderr)

ho_t2.cpp: In function 'bool ok(std::string, int)':
ho_t2.cpp:77:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |     for(int i=0; i<s.size(); i++)
      |                  ~^~~~~~~~~
ho_t2.cpp: In function 'void usaco(std::string)':
ho_t2.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
ho_t2.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     freopen(FOUT, "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87