oj.uz

Submission #611859

# Submission time Handle Problem Language Result Execution time Memory
611859 2022-07-29T08:10:35 Z amunduzbaev Election (BOI18_election) C++17
82 / 100
 3000 ms 91996 KB 
#include "bits/stdc++.h"
using namespace std;
 
#define ar array
typedef int64_t ll;
#define her cerr<<"here"<<endl;

const int N = 7e5 + 5;
const int B = 550;
int a[N], pref[N], suff[N], mx[2][N / B + 1], in[N / B + 1][B + 1][B + 1];
int pos[N / B + 1][B + 1], sos[N / B + 1][B + 1], used[N];
int pv[N / B + 1], sv[N / B + 1];

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n; cin >> n;
	string s; cin >> s;
	
	for(int b=0;b * B<n;b++){
		int l = b * B, r = min(n, (b + 1) * B);
		memset(pos[b], -1, sizeof pos[b]);
		for(int i=l;i<r;i++){
			if(s[i] == 'C') pref[i]--;
			else pref[i]++;
			if(i + 1 < r) pref[i + 1] = pref[i];
			mx[0][b] = max(mx[0][b], pref[i]);
			if(pref[i] > 0 && pos[b][pref[i]] == -1) pos[b][pref[i]] = i;
		}
		
		memset(sos[b], -1, sizeof sos[b]);
		for(int i=r-1;i>=l;i--){
			suff[i] = suff[i + 1];
			if(s[i] == 'C') suff[i]--;
			else suff[i]++;
			mx[1][b] = max(mx[1][b], suff[i]);
			if(suff[i] > 0 && sos[b][suff[i]] == -1) sos[b][suff[i]] = i;
		}
		mx[1][b]++, mx[0][b]++;
		for(int i=mx[0][b] - 1;i>0;i--){
			int cc = 0, r = i;
			for(int j=mx[1][b] - 1;j>0;j--){
				while(r < mx[0][b] && pos[b][r] < sos[b][j]) r++;
				if(r < mx[0][b]) cc++, r++;
				in[b][i][j] = cc;
			}
		}
	}
	
	int q; cin >> q;
	for(int i=0;i<q;i++){
		int l, r; cin >> l >> r;
		l--, r--;
		int l_ = l / B, r_ = r / B;
		if(l_ == r_){
			int sum = 0, x = 1, cnt = 0;
			for(int i=l;i<=r;i++){
				if(s[i] == 'C') sum--;
				else sum++;
				if(sum == x) used[i] = 1, cnt++, x++;
			}
			int is = 0; sum = 0, x = 1;
			for(int i=r;i>=l;i--){
				if(s[i] == 'C') sum--;
				else sum++;
				if(used[i]) is++, used[i] = 0;
				if(sum == x){
					if(!is) cnt++;
					else is--;
					x++;
				}
			}
			
			cout<<cnt<<"\n";
			for(int i=l;i<=r;i++) used[i] = 0;
			continue;
		}
		
		//~ cout<<l<<" "<<(l_ + 1) * B - 1<<" <-\n";
		int sum = 0, x = 1, cnt = 0;
		for(int i=l;i<(l_ + 1) * B;i++){
			if(s[i] == 'C') sum--;
			else sum++;
			//~ cout<<i<<" "<<sum<<" "<<x<<"\n";
			if(sum == x) used[i] = 1, cnt++, x++;
		}
		
		for(int b=l_+1;b<r_;b++){
			if(mx[0][b] > x - sum) pv[b] = x - sum;
			else pv[b] = mx[0][b];
			//~ cout<<b<<" "<<mx[0][b]<<" "<<pv[b]<<" <-\n";
			x += (mx[0][b] - pv[b]);
			cnt += (mx[0][b] - pv[b]);
			sum += suff[b * B];
		}
		for(int i=r_ * B;i<=r;i++){
			if(s[i] == 'C') sum--;
			else sum++;
			//~ cout<<i<<" "<<sum<<" "<<x<<"\n";
			if(sum == x) used[i] = 1, cnt++, x++;
		}
		//~ cout<<cnt<<" : ";
		int is = 0; sum = 0, x = 1;
		for(int i=r;i>=r_*B;i--){
			if(s[i] == 'C') sum--;
			else sum++;
			if(used[i]) is++, used[i] = 0;
			if(sum == x){
				if(!is) cnt++;
				else is--;
				x++;
			}
		}
		//~ cout<<cnt<<" : ";
		for(int b=r_-1;b>l_;b--){
			if(mx[1][b] > x - sum){
				sv[b] = x - sum;
				x += (mx[1][b] - x + sum);
			} else {
				sv[b] = mx[1][b];
			}
			
			is += in[b][pv[b]][sv[b]];
			//~ cout<<is<<" "<<mx[1][b]<<" "<<sv[b]<<"\n";
			cnt += max(0, mx[1][b] - sv[b] - is);
			is -= min(is, mx[1][b] - sv[b]);
			
			is += (mx[0][b] - pv[b] - in[b][pv[b]][sv[b]]);
			sum += suff[b * B];
		}
		//~ cout<<cnt<<" : ";
		for(int i=(l_ + 1) * B - 1;i>=l;i--){
			if(s[i] == 'C') sum--;
			else sum++;
			if(used[i]) is++, used[i] = 0;
			if(sum == x){
				if(!is) cnt++;
				else is--;
				x++;
			}
		}
		
		cout<<cnt<<"\n";
	}
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 724 KB Output is correct
2 Correct 8 ms 468 KB Output is correct
3 Correct 6 ms 340 KB Output is correct
4 Correct 7 ms 1408 KB Output is correct
5 Correct 4 ms 1108 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 724 KB Output is correct
2 Correct 8 ms 468 KB Output is correct
3 Correct 6 ms 340 KB Output is correct
4 Correct 7 ms 1408 KB Output is correct
5 Correct 4 ms 1108 KB Output is correct
6 Correct 375 ms 7984 KB Output is correct
7 Correct 338 ms 7244 KB Output is correct
8 Correct 318 ms 6864 KB Output is correct
9 Correct 207 ms 7256 KB Output is correct
10 Correct 333 ms 2880 KB Output is correct
11 Correct 484 ms 33324 KB Output is correct
12 Correct 188 ms 62712 KB Output is correct
13 Correct 222 ms 91996 KB Output is correct
14 Correct 199 ms 61788 KB Output is correct
15 Correct 155 ms 34540 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 724 KB Output is correct
2 Correct 8 ms 468 KB Output is correct
3 Correct 6 ms 340 KB Output is correct
4 Correct 7 ms 1408 KB Output is correct
5 Correct 4 ms 1108 KB Output is correct
6 Correct 375 ms 7984 KB Output is correct
7 Correct 338 ms 7244 KB Output is correct
8 Correct 318 ms 6864 KB Output is correct
9 Correct 207 ms 7256 KB Output is correct
10 Correct 333 ms 2880 KB Output is correct
11 Correct 484 ms 33324 KB Output is correct
12 Correct 188 ms 62712 KB Output is correct
13 Correct 222 ms 91996 KB Output is correct
14 Correct 199 ms 61788 KB Output is correct
15 Correct 155 ms 34540 KB Output is correct
16 Execution timed out 3049 ms 51788 KB Time limit exceeded
17 Halted 0 ms 0 KB -