Submission #979381

#	Time	Username	Problem	Language	Result	Execution time	Memory
979381		yeediot	Constellation 3 (JOI20_constellation3)	C++17	100 / 100	141 ms	23428 KiB

constellation3

#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;
#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);
}
const int mxn=2e5+5;
int n, m, h[mxn];
long long ans, bit[mxn];
void modify(int p,int v){
    for(;p<mxn;p+=p&-p){
        bit[p]+=v;
    }
}
long long query(int p){
    long long res=0;
    for(;p;p-=p&-p){
        res+=bit[p];
    }
    return res;
}
vector<int>H[mxn];
vector<pair<int,int>>star[mxn];
struct DSU{
    int to[mxn];
    void init(){
        for(int i=0;i<mxn;i++){
            to[i]=i;
        }
    }
    int find(int x){
        return x==to[x]?x:to[x]=find(to[x]);
    }
    void merge(int x,int y){
        x=find(x);
        y=find(y);
        to[x]=y;
    }
}l,r;
signed main(){
    setio();
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>h[i];
        H[h[i]].pb(i);
    }
    cin>>m;
    for(int i=1;i<=m;i++){
        int x,y,c;
        cin>>x>>y>>c;
        star[y].pb({x,c});
    }
    l.init(),r.init();
    for(int i=1;i<=n;i++){
        for(auto [id,c]:star[i]){
            int L=r.find(id),R=l.find(id);
            long long val=query(id);
            if(c>val){
                ans+=val;
                modify(L,c-val);
                modify(R+1,val-c);
            }
            else{
                ans+=c;
            }
        }
        for(auto id:H[i]){
            if(id>1 and h[id]>=h[id-1]){
                l.merge(id-1,id);
                r.merge(id,id-1);
            }
            if(id<n and h[id]>=h[id+1]){
                r.merge(id+1,id);
                l.merge(id,id+1);
            }
        }
    }
    cout<<ans<<'\n';
}
 /*
 input:
 
 */















 

Compilation message (stderr)

constellation3.cpp: In function 'void setIO(std::string)':
constellation3.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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
constellation3.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: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 65 / 65