oj.uz

Submission #611863

# Submission time Handle Problem Language Result Execution time Memory
611863 2022-07-29T08:11:17 Z amunduzbaev Election (BOI18_election) C++17
82 / 100
 3000 ms 69492 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 = 400;
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 6 ms 600 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 468 KB Output is correct
4 Correct 6 ms 1156 KB Output is correct
5 Correct 6 ms 980 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 600 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 468 KB Output is correct
4 Correct 6 ms 1156 KB Output is correct
5 Correct 6 ms 980 KB Output is correct
6 Correct 314 ms 7468 KB Output is correct
7 Correct 371 ms 6712 KB Output is correct
8 Correct 338 ms 6372 KB Output is correct
9 Correct 180 ms 6964 KB Output is correct
10 Correct 318 ms 2860 KB Output is correct
11 Correct 374 ms 25340 KB Output is correct
12 Correct 150 ms 50456 KB Output is correct
13 Correct 208 ms 69492 KB Output is correct
14 Correct 160 ms 47208 KB Output is correct
15 Correct 141 ms 28568 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 600 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 468 KB Output is correct
4 Correct 6 ms 1156 KB Output is correct
5 Correct 6 ms 980 KB Output is correct
6 Correct 314 ms 7468 KB Output is correct
7 Correct 371 ms 6712 KB Output is correct
8 Correct 338 ms 6372 KB Output is correct
9 Correct 180 ms 6964 KB Output is correct
10 Correct 318 ms 2860 KB Output is correct
11 Correct 374 ms 25340 KB Output is correct
12 Correct 150 ms 50456 KB Output is correct
13 Correct 208 ms 69492 KB Output is correct
14 Correct 160 ms 47208 KB Output is correct
15 Correct 141 ms 28568 KB Output is correct
16 Execution timed out 3012 ms 46268 KB Time limit exceeded
17 Halted 0 ms 0 KB -