Submission #489711

#	Time	Username	Problem	Language	Result	Execution time	Memory
489711		cpp219	Sirni (COCI17_sirni)	C++14	140 / 140	2142 ms	746908 KiB

sirni

#include<bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e7 + 9;
const ll inf = 1e9 + 7;

vector<LL> g[N];
vector<ll> a;
ll n,x,near[N],lab[N/100];

ll Find(ll u){
    if (lab[u] < 0) return u;
    return lab[u] = Find(lab[u]);
}
void Union(ll r,ll s){
    r = Find(r); s = Find(s);
    if (r == s) return;
    if (lab[r] > lab[s]) swap(r,s);
    lab[r] += lab[s]; lab[s] = r;
}

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "test"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin>>n;
    for (ll i = 1;i <= n;i++) cin>>x,a.push_back(x);
    sort(a.begin(),a.end()); a.resize(unique(a.begin(),a.end()) - a.begin());
    ll prv = 0;
    for (ll i = 0;i < a.size();i++){
        for (ll j = prv + 1;j <= a[i];j++) near[j] = i;
        prv = a[i];
    }
    memset(lab,-1,sizeof(lab));
    for (ll i = 0;i < a.size() - 1;i++){
        ll now = a[i];
        for (ll j = now;j <= a.back();j += now){
            ll nxt = near[j];
            if (j == now) nxt = near[j + 1];
            ll val = a[nxt] % now;
            g[val].push_back({i,nxt});
            //cout<<now<<" "<<a[nxt]<<" "<<val<<"\n";
        }
    }
    ll ans = 0; //return 0;
    for (ll i = 0;i <= a.back();i++){
        for (auto j : g[i]){
            if (Find(j.fs) != Find(j.sc)) ans += i;
            Union(j.fs,j.sc);
        }
    }
    cout<<ans;
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
	* DON'T GET STUCK ON ONE APPROACH
*/

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:38:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (ll i = 0;i < a.size();i++){
      |                   ~~^~~~~~~~~~
sirni.cpp:43:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (ll i = 0;i < a.size() - 1;i++){
      |                   ~~^~~~~~~~~~~~~~
sirni.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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