Submission #1157590

#	Time	Username	Problem	Language	Result	Execution time	Memory
1157590		guagua0407	Ski 2 (JOI24_ski2)	C++20	17 / 100	132 ms	1944 KiB

Main

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define int ll
#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);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

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

const ll inf=(ll)1e18;
const int inf2=1e9;
const int mxn=305;
vector<vector<ll>> dp(mxn,vector<ll>(mxn,inf));

signed main() {_
    ll n,K;
    cin>>n>>K;
    vector<ll> h(n),c(n);
    for(int i=0;i<n;i++){
        cin>>h[i]>>c[i];
    }
    ll mnh=*min_element(all(h));
    ll mnc=inf;
    for(int i=0;i<n;i++){
        if(h[i]==mnh) mnc=min(mnc,c[i]);
    }
    int pos;
    for(int i=0;i<n;i++){
        if(h[i]==mnh and c[i]==mnc){
            pos=i;
            break;
        }
    }
    ll sum=0;
    for(int i=0;i<n;i++){
        if(h[i]==mnh and i!=pos){
            h[i]++;
            sum+=K;
        }
    }
    vector<int> xs;
    for(int i=0;i<n;i++){
        xs.push_back(h[i]);
        xs.push_back(h[i]+1);
    }
    xs.push_back(inf2);
    sort(all(xs));
    xs.resize(unique(all(xs))-xs.begin());
    int sz=(int)xs.size();
    vector<int> cnt(sz);
    vector<ll> mn(sz,inf);
    for(int i=0;i<n;i++){
        int pos=lower_bound(all(xs),h[i])-xs.begin();
        cnt[pos]++;
        mn[pos]=min(mn[pos],c[i]);
    }
    auto cost=[&](int k,int j,int d){
        int dd=min(d,k/j);
        ll ans=1ll*(dd)*(dd+1)/2*j*K;
        int r=k-dd*j;
        ans+=1ll*r*K;
        //cout<<k<<' '<<j<<' '<<d<<' '<<ans<<'\n';
        return ans;
    };
    ll curmn=mn[0];
    dp[1][0]=0;
    for(int i=1;i<sz;i++){
        vector<vector<ll>> dpn(mxn,vector<ll>(mxn,inf));
        int d=xs[i]-xs[i-1]-1;
        for(int j=1;j<=n;j++){
            for(int k=0;k<=n;k++){
                dpn[j][max(0ll,max(0ll,k-j*d)+cnt[i]-j)]=min(dpn[j][max(0ll,max(0ll,k-j*d)+cnt[i]-j)],dp[j][k]+cost(k,j,d+1));
            }
        }
        for(int j=1;j<=n;j++){
            for(int k=0;k<=n;k++){
                if(k>0) dpn[j+1][k-1]=min(dpn[j+1][k-1],dpn[j][k]+curmn);
            }
        }
        swap(dp,dpn);
        curmn=min(curmn,mn[i]);
    }
    ll ans=inf;
    for(int j=0;j<=n;j++){
        ans=min(ans,dp[j][0]);
    }
    cout<<ans+sum<<'\n';
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz
// dp(i,j,k)->dp(i,j+1,k-1)+mn
// dp(i,j,k)->dp(i+1,j,max(0,k+cnt[i+1]-j))+K*k

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:17:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 12 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 33
• Subtask 5: 0 / 27
• Subtask 6: 0 / 14