제출 #990265

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
990265		imarn	별자리 3 (JOI20_constellation3)	C++14	100 / 100	237 ms	104004 KiB

constellation3

#include<bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define pii pair<ll,ll>
#define ll long long
#define sz(x) (ll)x.size()
using namespace std;
const int mxn=2e5+5;
pii t[20][mxn];
int up[20][mxn];
int lv[mxn]{0},rv[mxn]{0};
int ti[mxn],to[mxn],cur=0;
ll fw[mxn]{0};
ll dp[mxn]{0};
vector<pii>g[mxn];
void add(int i,ll amt){
    for(;i<mxn;i+=i&-i)fw[i]+=amt;
}
ll qr(int i,ll rs=0){
    for(;i;i-=i&-i)rs+=fw[i];return rs;
}
int get(int l,int r){
    int lg=log2(r-l+1);
    return max(t[lg][l],t[lg][r-(1<<lg)+1]).s;
}
int build(int l,int r){
    if(l==r)return l;
    int m=get(l,r);
    if(m>l)lv[m]=build(l,m-1),up[0][lv[m]]=m;
    if(m<r)rv[m]=build(m+1,r),up[0][rv[m]]=m;
    return m;
}
void dfs(int u){
    ti[u]=++cur;
    if(lv[u])dfs(lv[u]);
    if(rv[u])dfs(rv[u]);
    to[u]=cur;
    if(lv[u]){
        add(ti[u],dp[lv[u]]);
        add(to[u]+1,-dp[lv[u]]);
        add(ti[lv[u]],-dp[lv[u]]);
        add(to[lv[u]]+1,dp[lv[u]]);
    }
    if(rv[u]){
        add(ti[u],dp[rv[u]]);
        add(to[u]+1,-dp[rv[u]]);
        add(ti[rv[u]],-dp[rv[u]]);
        add(to[rv[u]]+1,dp[rv[u]]);
    }dp[u]=dp[lv[u]]+dp[rv[u]];
    for(auto v:g[u]){
        dp[u]=max(dp[u],v.s+qr(ti[v.f]));
    }
}
int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n;cin>>n;
    int a[n+1];for(int i=1;i<=n;i++)cin>>a[i],t[0][i]={a[i],i};
    for(int j=1;j<20;j++)for(int i=1;i+(1<<(j-1))<=n;i++)t[j][i]=max(t[j-1][i],t[j-1][i+(1<<(j-1))]);
    int root=build(1,n);up[0][root]=root;
    for(int j=1;j<20;j++)for(int i=1;i<=n;i++)up[j][i]=up[j-1][up[j-1][i]];
    int m;cin>>m;ll tt=0;
    for(int i=1;i<=m;i++){
        int x,y,c;cin>>x>>y>>c;int u=x;
        for(int j=19;j>=0;j--)if(a[up[j][u]]<y)u=up[j][u];
        g[u].pb({x,c});tt+=c;
    }dfs(root);cout<<tt-dp[root];
}

컴파일 시 표준 에러 (stderr) 메시지

constellation3.cpp: In function 'long long int qr(int, long long int)':
constellation3.cpp:21:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   21 |     for(;i;i-=i&-i)rs+=fw[i];return rs;
      |     ^~~
constellation3.cpp:21:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   21 |     for(;i;i-=i&-i)rs+=fw[i];return rs;
      |                              ^~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 65 / 65