Submission #675954

#	Time	Username	Problem	Language	Result	Execution time	Memory
675954		guagua0407	Martian DNA (BOI18_dna)	C++17	100 / 100	249 ms	13440 KiB

dna

/*
燒雞
 燒雞
  燒雞    好想進選訓
 燒雞
燒雞
*/
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end() 
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int mxn=2e5+5;
int num[mxn];
map<int,int> mp;
vector<int> cntr(mxn,0);
vector<bool> isenough(mxn,false);
set<int> have;
int n;

int main() {_
    //setIO("wayne");
    int k,R;
    cin>>n>>k>>R;
    for(int i=1;i<=n;i++){
        cin>>num[i];
    }
    for(int i=0;i<R;i++){
        int x,cnt;
        cin>>x>>cnt;
        mp[x]=cnt;
        have.insert(x);
    }
    int ans=n+1;
    int r=0;
    int cur=0;
    for(int l=1;l<=n;l++){
        while(cur<R and r+1<=n){
            r++;
            if(have.count(num[r])){
                cntr[num[r]]++;
                if(cntr[num[r]]>=mp[num[r]]){
                    if(isenough[num[r]]==false){
                        cur++;
                    }
                    isenough[num[r]]=true;
                }
            }
            if(r==n) break;
        }
        if(cur>=R){
            ans=min(ans,r-l+1);
        }
        if(have.count(num[l])==0) continue;
        cntr[num[l]]--;
        if(cntr[num[l]]<mp[num[l]]){
            if(isenough[num[l]]==true){
                cur--;
            }
            isenough[num[l]]=false;
        }
    }
    if(ans==n+1){
        cout<<"impossible";
    }
    else{
        cout<<ans;
    }
    return 0;
}
//maybe its multiset not set

Compilation message (stderr)

dna.cpp: In function 'void setIO(std::string)':
dna.cpp:19:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dna.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32