oj.uz

Submission #60049

# Submission time Handle Problem Language Result Execution time Memory
60049 2018-07-23T13:55:51 Z Kerim Election (BOI18_election) C++17
100 / 100
 2208 ms 114524 KB 
#include "bits/stdc++.h"
#define MAXN 500009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
char sa[MAXN];
int suf[MAXN],pre[MAXN],dp[MAXN*2];
vector<PII>query[MAXN];
vector<int>adj[MAXN];
int s[MAXN<<2],lazy[MAXN<<2],ans[MAXN],n;
void build(int nd,int x,int y){
	if(x==y){
		s[nd]=suf[x];
		return;
	}
	int mid=(x+y)>>1;
	build(nd<<1,x,mid);
	build(nd<<1|1,mid+1,y);
	s[nd]=min(s[nd<<1],s[nd<<1|1]);
}
void shift(int nd){
	int &ret=lazy[nd];
	if(!ret)
		return;
	lazy[nd<<1]+=ret;s[nd<<1]+=ret;	
	lazy[nd<<1|1]+=ret;s[nd<<1|1]+=ret;	
	ret=0;
}
void inc(int l,int r,int v,int nd,int x,int y){
	if(l>y or x>r)
		return;
	if(l<=x and y<=r){
		s[nd]+=v;
		lazy[nd]+=v;
		return;
	}
	shift(nd);
	int mid=(x+y)>>1;
	inc(l,r,v,nd<<1,x,mid);
	inc(l,r,v,nd<<1|1,mid+1,y);
	s[nd]=min(s[nd<<1],s[nd<<1|1]);
}
int tap(int l,int r,int nd,int x,int y){
	if(l>y or x>r)
		return INF;
	if(l<=x and y<=r)
		return s[nd];
	shift(nd);
	int mid=(x+y)>>1;
	return min(tap(l,r,nd<<1,x,mid),tap(l,r,nd<<1|1,mid+1,y));	
}
int P[MAXN][19];
int get(int x,int y){
	int res=0;
	for(int i=18;i>=0;i--)
		if(~P[x][i] and P[x][i]<=y)
			x=P[x][i],res+=(1<<i);
	return res;	
}
void dfs(int nd){
	tr(it,query[nd+1]){
		int r=it->ff,ind=it->ss;
		if(r==n)
			ans[ind]=max(0,-tap(nd+1,r,1,1,n));
		else
			ans[ind]=max(0,-tap(nd+1,r,1,1,n)+tap(r+1,r+1,1,1,n));	
		ans[ind]+=get(nd,r);
	}
	inc(1,nd,+1,1,1,n);
	for(int i=0;i<int(adj[nd].size());i++){
		int to=adj[nd][i];
		dfs(to);
	}
	inc(1,nd,-1,1,1,n);
}
int main(){
	memset(P,-1,sizeof P);
    //~ freopen("file.in", "r", stdin);
    scanf("%d",&n);
    scanf("%s",sa+1);
    for(int i=1;i<=n;i++){
		pre[i]=pre[i-1];
		if(sa[i]=='C')
			pre[i]++;
		else
			pre[i]--;
	}
	for(int i=n;i>=1;i--){
		suf[i]=suf[i+1];
		if(sa[i]=='C')
			suf[i]++;
		else
			suf[i]--;
	}
	vector<int>root;
	memset(dp,-1,sizeof dp);
	for(int i=n;i>=0;i--){
		if(~dp[pre[i]+n-1]){
			adj[dp[pre[i]+n-1]].pb(i);
			P[i][0]=dp[pre[i]+n-1];
			for(int j=1;j<=18;j++)
				if(~P[i][j-1])
					P[i][j]=P[P[i][j-1]][j-1];
		}
		else
			root.pb(i);
		dp[pre[i]+n]=i;
	}
	build(1,1,n);
	int q;
	scanf("%d",&q);
	for(int i=1;i<=q;i++){
		int l,r;
		scanf("%d%d",&l,&r);
		query[l].pb(mp(r,i));
	}
	tr(it,root)
		dfs(*it);
	for(int i=1;i<=q;i++)
		printf("%d\n",ans[i]);
    //~ int q;
    //~ scanf("%d",&q);
    //~ while(q--){
		//~ int l,r;
		//~ scanf("%d%d",&l,&r);
		//~ int last=l-1;
		//~ for(int i=l;i<=r;i++)
			//~ if(par[i]==par[last]-1){
				//~ last=i;
				//~ vis[i]=1;
			//~ }
		//~ int sum=0,mn=INF;
		//~ for(int i=r;i>=l;i--)
			//~ if(!vis[i]){
				//~ sum+=(s[i]=='C');
				//~ sum-=(s[i]=='T');
				//~ umin(mn,sum);
			//~ }
		//~ int ans=0;	
		//~ for(int i=l;i<=r;i++){
			//~ ans+=vis[i];
			//~ vis[i]=0;
		//~ }	
		//~ printf("%d\n",ans+max(0,-mn));
	//~ }
	return 0;
}

Compilation message

election.cpp: In function 'int main()':
election.cpp:93:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);
     ~~~~~^~~~~~~~~
election.cpp:94:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s",sa+1);
     ~~~~~^~~~~~~~~~~
election.cpp:125:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&q);
  ~~~~~^~~~~~~~~
election.cpp:128:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&l,&r);
   ~~~~~^~~~~~~~~~~~~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 65144 KB Output is correct
2 Correct 71 ms 65144 KB Output is correct
3 Correct 66 ms 65220 KB Output is correct
4 Correct 68 ms 65360 KB Output is correct
5 Correct 67 ms 65384 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 65144 KB Output is correct
2 Correct 71 ms 65144 KB Output is correct
3 Correct 66 ms 65220 KB Output is correct
4 Correct 68 ms 65360 KB Output is correct
5 Correct 67 ms 65384 KB Output is correct
6 Correct 223 ms 71148 KB Output is correct
7 Correct 198 ms 71148 KB Output is correct
8 Correct 249 ms 71148 KB Output is correct
9 Correct 205 ms 71148 KB Output is correct
10 Correct 266 ms 71148 KB Output is correct
11 Correct 312 ms 72492 KB Output is correct
12 Correct 261 ms 72492 KB Output is correct
13 Correct 246 ms 73636 KB Output is correct
14 Correct 250 ms 73636 KB Output is correct
15 Correct 218 ms 73636 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 65144 KB Output is correct
2 Correct 71 ms 65144 KB Output is correct
3 Correct 66 ms 65220 KB Output is correct
4 Correct 68 ms 65360 KB Output is correct
5 Correct 67 ms 65384 KB Output is correct
6 Correct 223 ms 71148 KB Output is correct
7 Correct 198 ms 71148 KB Output is correct
8 Correct 249 ms 71148 KB Output is correct
9 Correct 205 ms 71148 KB Output is correct
10 Correct 266 ms 71148 KB Output is correct
11 Correct 312 ms 72492 KB Output is correct
12 Correct 261 ms 72492 KB Output is correct
13 Correct 246 ms 73636 KB Output is correct
14 Correct 250 ms 73636 KB Output is correct
15 Correct 218 ms 73636 KB Output is correct
16 Correct 1608 ms 100596 KB Output is correct
17 Correct 1475 ms 100596 KB Output is correct
18 Correct 1543 ms 100596 KB Output is correct
19 Correct 1664 ms 100596 KB Output is correct
20 Correct 1731 ms 100596 KB Output is correct
21 Correct 2208 ms 110476 KB Output is correct
22 Correct 1656 ms 110476 KB Output is correct
23 Correct 1859 ms 114524 KB Output is correct
24 Correct 1893 ms 114524 KB Output is correct
25 Correct 1740 ms 114524 KB Output is correct