Submission #608828

#	Time	Username	Problem	Language	Result	Execution time	Memory
608828		Urvuk3	Election (BOI18_election)	C++17	0 / 100	2 ms	468 KiB

election

#include <bits/stdc++.h>

using namespace std;

#define ll long long
ll INF=1e9,LINF=1e18,MOD=1e9+7; const ll MAXN=1e3+1,MAXA=1e5+1;
#define fi first
#define se second
#define pii pair<int,int>
#define mid ((l+r)/2)
#define sz(a) (int((a).size()))
#define all(a) a.begin(),a.end()
#define endl "\n"
#define PRINT(x) cerr<<#x<<'-'<<x<<endl<<flush;
#define pb push_back
#define PRINTvec(x) { cerr<<#x<<"-"; for(int i=0;i<sz(x);i++) cerr<<x[i]<<" "; cerr<<endl; }
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

struct Node{
    int inc,dec,sum,ans,l,r;
    void PRINTnode(){
        cerr<<"["<<l<<","<<r<<"]"<<endl;
        cerr<<"inc="<<inc<<endl;
        cerr<<"dec="<<dec<<endl;
        cerr<<"sum="<<sum<<endl;
        cerr<<"ans="<<ans<<endl;
    }
};

void Solve(){
    int N,Q; cin>>N;
    string S; cin>>S;
    vector<Node> seg(4*(N+1));
    function<Node(Node,Node)> Merge=[&](Node n1,Node n2){
        Node ret;
        ret.inc=max(n1.inc,n1.sum+n2.inc);
        ret.dec=max(n2.dec,n2.sum+n1.dec);
        ret.sum=n1.sum+n2.sum;
        ret.ans=max({n1.inc+n2.ans,n1.ans+n2.dec,n1.inc+n2.dec});
        ret.l=n1.l;
        ret.r=n2.r;
        return ret;
    };
    function<void(int,int,int)> Init=[&](int node,int l,int r){
        if(l==r){
            if(S[l-1]=='T') seg[node]={1,1,1,1,l,r};
            else seg[node]={0,0,-1,0,l,r};
            return;
        }
        Init(2*node,l,mid); Init(2*node+1,mid+1,r);
        seg[node]=Merge(seg[2*node],seg[2*node+1]);
    };
    function<Node(int,int,int,int,int)> Query=[&](int node,int l,int r,int L,int R){
        if(L<=l && r<=R){
            return seg[node];
        }
        Node ret={0,0,0,0};
        if(L<=mid) ret=Merge(ret,Query(2*node,l,mid,L,R));
        if(R>mid) ret=Merge(ret,Query(2*node+1,mid+1,r,L,R));
        return ret;
    };
    Init(1,1,N);
    cin>>Q;
    while(Q--){
        int l,r; cin>>l>>r;
        int res=Query(1,1,N,l,r).ans;
        cout<<res<<endl;
    }
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t; t=1;
    //cin>>t;
    while(t--){
        Solve();
    }
    return 0;
}

• Subtask 1: 0 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18