Submission #795262

#	Time	Username	Problem	Language	Result	Execution time	Memory
795262		Theo830	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	6 ms	3288 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9+7;
const ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<ll,ii>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,k;
    cin>>n>>k;
    string s;
    cin>>s;
    vll ex[3];
    ll p[3] = {0};
    f(i,0,n){
        if(s[i] == 'J'){
            ex[0].pb(i);
        }
        else if(s[i] == 'O'){
            ex[1].pb(i);
        }
        else{
            ex[2].pb(i);
        }
    }
    ll ans = n+1;
    f(i,0,n){
        while(p[0] < ex[0].size() && ex[0][p[0]] < i){
            p[0]++;
        }
        if(p[0]+k-1 >= ex[0].size()){
            break;
        }
        while(p[1] < ex[1].size() && ex[1][p[1]] < ex[0][p[0] + k - 1]){
            p[1]++;
        }
        if(p[1]+k-1 >= ex[1].size()){
            break;
        }
        while(p[2] < ex[2].size() && ex[2][p[2]] < ex[1][p[1] + k - 1]){
            p[2]++;
        }
        if(p[2]+k-1 >= ex[2].size()){
            break;
        }
        ans = min(ans,n - ex[0][p[0]] - (n-1 - ex[2][p[2] + k-1]) - 3 * k);
    }
    if(ans == n+1){
        ans = -1;
    }
    cout<<ans<<"\n";
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:47:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         while(p[0] < ex[0].size() && ex[0][p[0]] < i){
      |               ~~~~~^~~~~~~~~~~~~~
ho_t2.cpp:50:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         if(p[0]+k-1 >= ex[0].size()){
      |            ~~~~~~~~~^~~~~~~~~~~~~~~
ho_t2.cpp:53:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |         while(p[1] < ex[1].size() && ex[1][p[1]] < ex[0][p[0] + k - 1]){
      |               ~~~~~^~~~~~~~~~~~~~
ho_t2.cpp:56:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |         if(p[1]+k-1 >= ex[1].size()){
      |            ~~~~~~~~~^~~~~~~~~~~~~~~
ho_t2.cpp:59:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |         while(p[2] < ex[2].size() && ex[2][p[2]] < ex[1][p[1] + k - 1]){
      |               ~~~~~^~~~~~~~~~~~~~
ho_t2.cpp:62:21: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         if(p[2]+k-1 >= ex[2].size()){
      |            ~~~~~~~~~^~~~~~~~~~~~~~~

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