oj.uz

Submission #311016

# Submission time Handle Problem Language Result Execution time Memory
311016 2020-10-09T06:08:47 Z gevacrt Election (BOI18_election) C++17
100 / 100
 2019 ms 73480 KB 
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

typedef vector<int> vi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vi> vvi;
typedef vector<vii> vvii;

#define INF INT_MAX
#define MOD 1000000007
#define all(x) x.begin(), x.end()

struct nda{
    int sum, cost;
};

nda merge(nda a, nda b){
    if(a.sum == -1) return b;
    if(b.sum == -1) return a;

    int k = min(a.cost, b.sum);
    a.cost -= k, b.sum -= k;
    return {a.sum+b.sum, a.cost+b.cost};
}

class SegTree{
    vector<nda> st; int l, r;

    void Update(int node, int l, int r, int L, int R, nda val){
        if(r < L or R < l) return;
        if(L <= l and r <= R){
            st[node] = val;
            return;
        }

        int m = (l+r)>>1;
        Update(node*2, l, m, L, R, val);
        Update(node*2+1, m+1, r, L, R, val);
        st[node] = merge(st[node*2], st[node*2+1]);
        return;
    }

    nda Query(int node, int l, int r, int L, int R){
        if(r < L or R < l) return {-1,0};
        if(L <= l and r <= R) return st[node];
        int m = (l+r)>>1;
        auto v1 = Query(node*2, l, m, L, R);
        auto v2 = Query(node*2+1, m+1, r, L, R);
        return merge(v1, v2);
    }

    public:
        SegTree(int l, int r){
            int sz = (r-l+1); st.resize(4*sz, {0,0});
            this->l = l, this->r = r;
        }

        void Update(int L, int R, nda val){
            Update(1, l, r, L, R, val);
            return;
        }

        int Query(int L, int R){
            return Query(1, l, r, L, R).cost;
        }
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    int n; cin >> n;
    string s; cin >> s;
    int q; cin >> q;

    vector<vvi> qry(n);
    for(int x = 0; x < q; x++){
        int l, r; cin >> l >> r;
        qry[l-1].push_back({r-1, x});
    }

    vi ans(q);
    SegTree ST(0, n-1);
    deque<int> tloc;
    for(int x = n-1; x >= 0; x--){
        if(s[x] == 'C'){
            ST.Update(x,x,{1,0});
            if(!tloc.empty()){
                int prev = tloc.front(); tloc.pop_front();
                ST.Update(prev, prev, {0,1});
            }
        }else tloc.push_front(x);


        for(auto qq : qry[x]){
            ans[qq[1]] = upper_bound(all(tloc), qq[0]) - tloc.begin() + ST.Query(x, qq[0]);
        }
    }

    for(int x= 0; x < q; x++)
        cout << ans[x] << endl;

    return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 640 KB Output is correct
2 Correct 6 ms 640 KB Output is correct
3 Correct 7 ms 640 KB Output is correct
4 Correct 7 ms 640 KB Output is correct
5 Correct 7 ms 640 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 640 KB Output is correct
2 Correct 6 ms 640 KB Output is correct
3 Correct 7 ms 640 KB Output is correct
4 Correct 7 ms 640 KB Output is correct
5 Correct 7 ms 640 KB Output is correct
6 Correct 243 ms 10232 KB Output is correct
7 Correct 226 ms 10360 KB Output is correct
8 Correct 242 ms 10164 KB Output is correct
9 Correct 251 ms 10104 KB Output is correct
10 Correct 247 ms 10104 KB Output is correct
11 Correct 250 ms 10400 KB Output is correct
12 Correct 245 ms 10232 KB Output is correct
13 Correct 246 ms 10360 KB Output is correct
14 Correct 242 ms 10360 KB Output is correct
15 Correct 246 ms 10360 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 640 KB Output is correct
2 Correct 6 ms 640 KB Output is correct
3 Correct 7 ms 640 KB Output is correct
4 Correct 7 ms 640 KB Output is correct
5 Correct 7 ms 640 KB Output is correct
6 Correct 243 ms 10232 KB Output is correct
7 Correct 226 ms 10360 KB Output is correct
8 Correct 242 ms 10164 KB Output is correct
9 Correct 251 ms 10104 KB Output is correct
10 Correct 247 ms 10104 KB Output is correct
11 Correct 250 ms 10400 KB Output is correct
12 Correct 245 ms 10232 KB Output is correct
13 Correct 246 ms 10360 KB Output is correct
14 Correct 242 ms 10360 KB Output is correct
15 Correct 246 ms 10360 KB Output is correct
16 Correct 1976 ms 71704 KB Output is correct
17 Correct 1925 ms 72968 KB Output is correct
18 Correct 1922 ms 70920 KB Output is correct
19 Correct 1850 ms 71436 KB Output is correct
20 Correct 1985 ms 70956 KB Output is correct
21 Correct 2019 ms 73228 KB Output is correct
22 Correct 1991 ms 72796 KB Output is correct
23 Correct 2016 ms 73480 KB Output is correct
24 Correct 1979 ms 72716 KB Output is correct
25 Correct 1960 ms 72064 KB Output is correct