oj.uz

Submission #611860

# Submission time Handle Problem Language Result Execution time Memory
611860 2022-07-29T08:10:56 Z amunduzbaev Election (BOI18_election) C++17
82 / 100
 3000 ms 76480 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 = 450;
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 596 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 6 ms 1108 KB Output is correct
5 Correct 4 ms 852 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 596 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 6 ms 1108 KB Output is correct
5 Correct 4 ms 852 KB Output is correct
6 Correct 305 ms 7520 KB Output is correct
7 Correct 299 ms 6688 KB Output is correct
8 Correct 276 ms 6372 KB Output is correct
9 Correct 171 ms 6996 KB Output is correct
10 Correct 314 ms 2852 KB Output is correct
11 Correct 401 ms 28008 KB Output is correct
12 Correct 155 ms 54936 KB Output is correct
13 Correct 177 ms 76480 KB Output is correct
14 Correct 166 ms 52112 KB Output is correct
15 Correct 155 ms 29612 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 596 KB Output is correct
2 Correct 5 ms 468 KB Output is correct
3 Correct 5 ms 340 KB Output is correct
4 Correct 6 ms 1108 KB Output is correct
5 Correct 4 ms 852 KB Output is correct
6 Correct 305 ms 7520 KB Output is correct
7 Correct 299 ms 6688 KB Output is correct
8 Correct 276 ms 6372 KB Output is correct
9 Correct 171 ms 6996 KB Output is correct
10 Correct 314 ms 2852 KB Output is correct
11 Correct 401 ms 28008 KB Output is correct
12 Correct 155 ms 54936 KB Output is correct
13 Correct 177 ms 76480 KB Output is correct
14 Correct 166 ms 52112 KB Output is correct
15 Correct 155 ms 29612 KB Output is correct
16 Execution timed out 3093 ms 47720 KB Time limit exceeded
17 Halted 0 ms 0 KB -