Submission #44115

#	Time	Username	Problem	Language	Result	Execution time	Memory
44115		imaxblue	Strongbox (POI11_sej)	C++17	100 / 100	162 ms	19428 KiB

sej

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define mp make_pair
#define pb push_back
#define x first
#define y second
#define pii pair<int, int>
#define p3i pair<pii, int>
#define pll pair<ll, ll>
#define p3l pair<pll, ll>
#define lseg L, (L+R)/2, N*2+1
#define rseg (L+R)/2+1, R, N*2+2
#define ub upper_bound
#define lb lower_bound
#define pq priority_queue
#define MN 1000000007
#define fox(k, x) for (int k=0; k<x; ++k)
#define fox1(k, x) for (int k=1; k<=x; ++k)
#define foxr(k, x) for (int k=x-1; k>=0; --k)
#define fox1r(k, x) for (int k=x; k>0; --k)
#define ms multiset
#define flood(x) memset(x, 0x3f3f3f3f, sizeof x)
#define drain(x) memset(x, 0, sizeof x)
#define rng() ((rand() << 14)+rand())
#define scan(X) do{while((X=getchar())<'0'); for(X-='0'; '0'<=(_=getchar()); X=(X<<3)+(X<<1)+_-'0');}while(0)
char _;
#define pi 3.14159265358979323846

ll gcd(ll x, ll y){return y==0?x:gcd(y, x%y);}

vector<ll> f;
ll d;
ll n, a[250005], k, g, c, p=0, weight[20]={1}, cnt[20];
set<ll> s;
bool dp[10000000];
void factor(ll X){
    for (ll l=2; l*l<=X; ++l){
        if (X%l==0){
            f.pb(l);
            c=0;
            while(X%l==0){
                X/=l;
                c++;
            }
            cnt[p]=c;
            weight[p+1]=weight[p]*(c+1);
            ++p;
        }
    }
    if (X>1){
        cnt[p]=1;
        weight[p+1]=weight[p]*2;
        ++p;
        f.pb(X);
    }
}
bool check(ll G){
    if (g/G<n*20){
        for(ll l=G; l<g; l+=G) if (s.count(l)) return 0;
        return 1;
    }
    fox(l, n){
        if ((a[l]%g)%G==0) return 0;
    }
    return 1;
}
ll common(ll X){
    ll t=0;
    fox(l, p){
        c=0;
        while(X%f[l]==0){
            X/=f[l];
            c++;
        }
        t+=min(c, cnt[l])*weight[l];
    }
    return t;
}
ll val(ll X){
    ll t=1;
    fox(l, p){
        c=X/weight[l]%(cnt[l]+1);
        fox(l2, c) t*=f[l];
    }
    return t;
}
int main(){
    scanf("%lli%lli", &d, &n);
    --n; fox(l, n) scan(a[l]);
    scanf("%lli", &k);
    g=gcd(k, d);
    factor(g);
    fox(l, n){
        a[l]%=g;
        dp[common(a[l])]=1;
        //cout << common(a[l]) << endl;
    }
    //return 0;
    //cout << k << ' ' << d << ' ' << g << endl;
    ll ans=0;
    foxr(l, weight[p]){
        //cout << l << ' ' << dp[l] << ' ' << val(l)<< endl;
        if (dp[l]==0){
            ans=max(ans, d/val(l));
            continue;
        }
        fox(l2, p){
            if (l/weight[l2]%(cnt[l2]+1)>0){
                dp[l-weight[l2]]=1;
            }
        }
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

sej.cpp: In function 'int main()':
sej.cpp:89:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lli%lli", &d, &n);
     ~~~~~^~~~~~~~~~~~~~~~~~~~
sej.cpp:91:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lli", &k);
     ~~~~~^~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 7 / 7
• Subtask 5: 7 / 7
• Subtask 6: 7 / 7
• Subtask 7: 7 / 7
• Subtask 8: 7 / 7
• Subtask 9: 7 / 7
• Subtask 10: 7 / 7
• Subtask 11: 7 / 7
• Subtask 12: 7 / 7
• Subtask 13: 8 / 8
• Subtask 14: 8 / 8