Submission #971898

#	Time	Username	Problem	Language	Result	Execution time	Memory
971898		yeediot	Pinball (JOI14_pinball)	C++17	11 / 100	115 ms	33732 KiB

pinball

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}

template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void setio(){freopen("/Users/iantsai/Library/Mobile Documents/com~apple~CloudDocs/cpp/Empty.md","r",stdin);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}
struct line{
    int a,b;
    int operator()(const int x)const{
        return a*x+b;
    }
};
bool check(line l1,line l2,line l3){
    return (l3.b-l2.b)*(l1.a-l2.a)<=(l2.b-l1.b)*(l2.a-l3.a);
}
vector<int>temp;
int get(int x){
    return lower_bound(all(temp),x)-temp.begin()+1;
}
const int mxn=3e5+5;
const int inf=1e18;
int n;
struct segtree{
    int seg[4*mxn];
    bool upd=0;
    void build(int l,int r,int id){
        seg[id]=inf;
        if(l==r){
            return;
        }
        int mm=l+r>>1;
        build(l,mm,id*2);
        build(mm+1,r,id*2+1);
    }
    void modify(int l,int r,int id,int p,int v){
        if(l==r){
            if(v<=seg[id]){
                upd=1;
            }
            chmin(seg[id],v);
            return;
        }
        int mm=l+r>>1;
        if(p<=mm){
            modify(l,mm,id*2,p,v);
        }
        else{
            modify(mm+1,r,id*2+1,p,v);
        }
        seg[id]=min(seg[id*2],seg[id*2+1]);
    }
    int query(int l,int r,int id,int ql,int qr){
        if(qr<l or r<ql){
            return inf;
        }
        if(ql<=l and r<=qr){
            return seg[id];
        }
        int mm=l+r>>1;
        return min(query(l,mm,id*2,ql,qr),query(mm+1,r,id*2+1,ql,qr));
    }
    void modify(int p,int v){
        modify(1,sz(temp),1,get(p),min(v,inf));
    }
    int query(int ql,int qr){
        return query(1,sz(temp),1,get(ql),get(qr));
    }
}tl,tr;
vector<tuple<int,int,int,int>>v;
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    int m;
    cin>>n>>m;
    for(int i=1;i<=n;i++){
        int a,b,c,d;
        cin>>a>>b>>c>>d;
        temp.pb(a);
        temp.pb(b);
        temp.pb(c);
        v.pb({a,b,c,d});
    }
    temp.pb(1);
    temp.pb(m);
    for(int i=1;i<=m;i++){
        temp.pb(i);
    }
    sort(all(temp));
    temp.resize(unique(all(temp))-temp.begin());
    tl.build(1,sz(temp),1);
    tr.build(1,sz(temp),1);
    tl.modify(1,0);
    tr.modify(m,0);
    int ans=inf;
    for(int i=1;i<=n;i++){
        auto [a,b,c,d]=v[i-1];
        bool mn=0;
        tl.upd=0;
        tr.upd=0;
        int x=tl.query(a,b);
        int y=tr.query(a,b);
        chmin(ans,x+y+d);
        tl.modify(c,x+d);
        tr.modify(c,y+d);
    }
    cout<<(ans>=1e18?-1:ans)<<'\n';
}
 /*
 input:
 
 */















 

Compilation message (stderr)

pinball.cpp: In member function 'void segtree::build(long long int, long long int, long long int)':
pinball.cpp:69:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   69 |         int mm=l+r>>1;
      |                ~^~
pinball.cpp: In member function 'void segtree::modify(long long int, long long int, long long int, long long int, long long int)':
pinball.cpp:81:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   81 |         int mm=l+r>>1;
      |                ~^~
pinball.cpp: In member function 'long long int segtree::query(long long int, long long int, long long int, long long int, long long int)':
pinball.cpp:97:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   97 |         int mm=l+r>>1;
      |                ~^~
pinball.cpp: In function 'int main()':
pinball.cpp:136:14: warning: unused variable 'mn' [-Wunused-variable]
  136 |         bool mn=0;
      |              ^~
pinball.cpp: In function 'void setIO(std::string)':
pinball.cpp:42:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49