Submission #73847

#	Time	Username	Problem	Language	Result	Execution time	Memory
73847		jiaqing23	Election (BOI18_election)	C++14	28 / 100	3032 ms	1300 KiB

election

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fbo find_by_order
#define ook order_of_key

typedef long long ll;
typedef pair<ll,ll> pi;
typedef vector<ll> vi;
typedef long double ld;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
typedef set<ll>::iterator sit;
typedef map<ll,ll>::iterator mit;
typedef pair<int,pair<int,int> > tri;

int n, q;
string s;
int used[500050];

void calcpre(int l, int r){
    int now = 0;
    for(int i = l; i <= r; i++){
        if(used[i]) continue;
        if(s[i] == 'C') now--;
        else now++;
        if(now > 0){
            used[i] = 1;
            now--;
        }
    }
}

void calcsuf(int l, int r){
    int now = 0;
    for(int i = r; i >= l; i--){
        if(used[i]) continue;
        if(s[i] == 'C') now--;
        else now++;
        if(now > 0){
            used[i] = 1;
            now--;
        }
    }
}

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> s >> q;
    while(q--){
        int l, r;
        cin >> l >> r;
        l--; r--;

        calcpre(l,r); calcsuf(l,r);

        int ans = 0;
        for(int i = l; i <= r; i++) {
            if(used[i]) ans++;
            used[i] = 0;
        }
        cout << ans << endl;
    }
	return 0;
}

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