Submission #1038049

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038049		ttamx	Islands (IOI08_islands)	C++17	0 / 100	4123 ms	131076 KiB

islands

#include <bits/stdc++.h>

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n,t,k;
double p;
string ans;

int ask(int l,int r){
    string s(n,'0');
    for(int i=l;i<=r;i++)s[i]='1';
    cout << "Q " << s << endl;
    char res;
    cin >> res;
    return res=='P';
}

void solve(int l,int r){
    if(l==r)return void(ans[l]='1');
    int m=(l+r)/2;
    bool found=false;
    if(rng()&1){
        if(ask(l,m)){
            solve(l,m);
            found=true;
        }
        if(!found||ask(m+1,r)){
            solve(m+1,r);
        }
    }else{
        if(ask(m+1,r)){
            solve(m+1,r);
            found=true;
        }
        if(!found||ask(l,m)){
            solve(l,m);
        }
    }
}

void runcase(){
    ans=string(n,'0');
    for(int l=0,r=k-1;l<n;l+=k,r+=k){
        r=min(r,n-1);
        if(ask(l,r))solve(l,r);
    }
    cout << "A " << ans << endl;
    string s;
    cin >> s;
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> p >> t;
    double q=1-p,r=q;
    k=1;
    while(r>0.5&&k<n){
        r*=q;
        k++;
    }
    while(t--)runcase();
}

• Subtask 1: 0 / 33
• Subtask 2: 0 / 3
• Subtask 3: 0 / 4
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10