Submission #939569

#	Time	Username	Problem	Language	Result	Execution time	Memory
939569		Mighilon	Election (BOI18_election)	C++17	100 / 100	395 ms	27412 KiB

election

#include <bits/stdc++.h>
using namespace std;
 
#ifdef DEBUG
#include "../Library/debug.h"
#else
#define dbg(x...)
// #define cin fin
// #define cout fout
// const string FILE_NAME = "elections"; ifstream fin(FILE_NAME + ".in"); ofstream fout(FILE_NAME + ".out");
#endif
 
typedef long long ll;
// typedef long double ld;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pi> vpi;
// typedef vector<pl> vpl; 
 
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) for (int i = 0; i < (a); ++i)
// #define FORd(i, a, b) for (int i = (b) - 1; i >= (a); --i)
// #define F0rd(i, a) for (int i = (a) - 1; i >= 0; --i)
#define trav(a, x) for (auto& a : x)
#define f first 
#define s second
#define pb push_back
// #define sz(x) (int)(x).size()
#define all(x) x.begin(), x.end()
 
const char nl = '\n';
const int INF = 1e9;
const int MOD = 1e9 + 7;

struct info{
    int l, r, s, a;
};

/* ostream& operator<< (ostream& stream, info x){ */
/*     stream << x.t << " " << x.c << " " << x.t2 << " " << x.c2; */
/*     return stream; */
/* } */

struct SegTree{
    int size;
    vector<info> t;
    SegTree(int _size){
        if(__builtin_popcount(_size) != 1){
            _size = 1 << (32 - __builtin_clz(_size));
        }
        size = _size;
        t.resize(2 * size);
    }
    info merge(info a, info b){
        info tmp = {0, 0, 0, 0};
        tmp.l = max(a.l, a.s + b.l);
        tmp.r = max(a.r + b.s, b.r);
        tmp.s = a.s + b.s;
        tmp.a = max({a.a + b.s, b.a + a.s, a.l + b.r});
        return tmp;
    }
    info query(int x, int l, int r, int ql, int qr){
        if(l > qr || r < ql){
            return {0, 0, 0, 0};
        }
        if(l >= ql && r <= qr){
            return t[x];
        }
        int m = (l + r) / 2;
        return merge(query(2 * x, l, m, ql, qr), query(2 * x + 1, m + 1, r, ql, qr));
    }
    info query(int l, int r){
        return query(1, 0, size - 1, l, r);
    }

};
 
void solve(){
    int n;
    cin >> n;
    SegTree tree(n);
    for(int i = 0; i < n; ++i){
        char c;
        cin >> c;
        if(c == 'C'){
            tree.t[tree.size + i] = {0, 0, -1, 0};
        }
        else{
            tree.t[tree.size + i] = {1, 1, 1, 1};
        }
    }
    for(int i = tree.size - 1; i > 0; --i){
        tree.t[i] = tree.merge(tree.t[2 * i], tree.t[2 * i + 1]);
    }
    /* for(int i = 1; i < 2 * tree.size; ++i){ */
    /*     cout << i << " " << tree.t[i] << nl; */

    /* } */
    int q; cin >> q;
    for(int i = 0; i < q; ++i){
        int l, r;
        cin >> l >> r; --l, --r;
        info tmp = tree.query(l, r);
        cout << tmp.a << nl;
    }
}
 
int32_t main(){
    ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    
    int TC = 1;
    // cin >> TC;
    while(TC--){
        solve();
    }
    return 0;
}

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