Submission #1016078

#	Time	Username	Problem	Language	Result	Execution time	Memory
1016078		dosts	Election (BOI18_election)	C++17	0 / 100	2 ms	604 KiB

election

//Dost SEFEROĞLU
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " << 
#define vi vector<int>
#define vvi vector<vi>
const int N = 4e5+1,inf = 2e18,B = 23,MOD = 998244353,LIM = 1e9;    

struct Node {
    int sm,wp,ws,ans;
};

Node merge(Node a,Node b) {
    Node ret;
    ret.sm = a.sm+b.sm;
    ret.wp = max(a.wp,a.sm+b.wp);
    ret.ws = max(b.ws,b.sm+a.ws);
    ret.ans = max({a.ans+b.ws,b.ans+a.wp,a.wp+b.ws});
    return ret;
};

struct ST {
    vector<Node> t;
    ST(int nn) {
        t.assign(4*nn+1,{0,0,0,0});
    } 

    void update(int node,int l,int r,int p,int v) {
        if (l == r) {
            t[node] = {v,max(0ll,v),max(0ll,v),max(0ll,v)};
            return;
        }
        int m = (l+r) >> 1;
        if (p <= m) update(2*node,l,m,p,v);
        else update(2*node+1,m+1,r,p,v);
        t[node] = merge(t[2*node],t[2*node+1]);
    }
    Node query(int node,int l,int r,int L,int R) {
        if (l > R || r < L) return {0,0,0,0};
        if (l >= L && r <= R) return t[node];
        int m = (l+r) >> 1;
        return merge(query(2*node,l,m,L,R),query(2*node+1,m+1,r,L,R));
    }

};
void solve() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    ST st(n);
    for (int i=1;i<=n;i++) {
        if (s[i-1] == 'C') st.update(1,1,n,i,-1);
        else st.update(1,1,n,i,1);
    }
    int q;
    cin >> q;
    while (q--) {
        int l,r;
        cin >> l >> r;
        cout << st.query(1,1,n,l,r).ans << '\n';
    }
}


                
                            
signed main() { 
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    #ifdef Dodi
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t; 
    while (t --> 0) solve();
}

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