679A - Bear and Prime 100 - CodeForces Solution

constructive algorithms interactive math *1400

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Python Code: 

from sys import stdout
p = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47]
p2 = [4, 9, 25, 49]
ans = 0
for i in p:
    if ans >= 2:
        break
    print(i)
    stdout.flush()
    n = input() == 'yes'
    ans += 1 if n else 0
for i in p2:
    if ans >= 2:
        break
    print(i)
    stdout.flush()
    n = input() == 'yes'
    ans += 1 if n else 0
print('prime' if ans < 2 else 'composite')
stdout.flush()

C++ Code: 

// Author: Awan
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
const int inf = 1e18;
#define print(x) for(auto p:x){cout << p << " ";} cout << endl;
const int MOD = 1e9 + 7;
const int N = 2e5+3;
#define time cerr << "Time : " << 1000 * ((double)clock()) / (double)CLOCKS_PER_SEC << "ms\n"


bool divisible(int a) {
    printf("%d\n", a);
    fflush(stdout);
    char sl[10];
    scanf("%s", sl);
    return sl[0] == 'y' || sl[0] == 'Y';
}

void solve(){
    vector<bool> number(101, false);
    vector<int> prime;
    for(int i=2;i<=50;i++){
        if(!number[i]){
            prime.push_back(i);
            for(int j=i*i;j<=100;j+=i){
                number[j] = true;
            }
        }
    }
    // print(prime);
    int cnt = 0;
    for(auto x:prime){
        if(divisible(x)){
            cnt++;
            if(x*x <= 50){
                if(divisible(x*x)){
                    cnt++;
                }
            }
        }
        if(cnt >= 2) break;
    }

    if(cnt >= 2){
        cout << "composite" << endl;
    }
    else {
        cout << "prime" << endl;
    }
}

signed main(){
    int t=1;
    // cin>>t;
    while(t--){
        solve();
    }
}


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