제출 #486480

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
486480		MilosMilutinovic	Election (BOI18_election)	C++14	0 / 100	1 ms	448 KiB

election

#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef long long ll;
typedef pair<int,int> PII;
typedef double db;
mt19937 mrand(random_device{}()); 
const ll mod=1000000007;
const ll mod2=998244353;
int rnd(int x) { return mrand() % x;}
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head

const int N=101000;
int n,q;
char s[N];

struct node {
	int pf,sf,s,f;
}nd[4*N];
node comb(node x,node y) {
	node ret;
	ret.pf=max(x.pf,x.s+y.pf);
	ret.sf=max(y.sf,y.s+x.sf);
	ret.s=x.s+y.s;
	ret.f=max({x.f+y.s,x.s+y.f,x.pf+y.sf});
	return ret;
}
void build(int p,int l,int r) {
	if (l==r) {
		if (s[l]=='C') {
			nd[p].pf=nd[p].sf=nd[p].s=nd[p].f=1;
		} else {
			nd[p].pf=nd[p].sf=nd[p].s=nd[p].f=0;		
		}
	} else {
		int md=l+r>>1;
		build(p+p,l,md);
		build(p+p+1,md+1,r);
		nd[p]=comb(nd[p+p],nd[p+p+1]);
	}
}
node get(int p,int l,int r,int ql,int qr) {
	if (ql>r||qr<l) return {0,0,0,0};
	if (ql<=l&&r<=qr) return nd[p];
	int md=l+r>>1;
	return comb(get(p+p,l,md,ql,qr),get(p+p+1,md+1,r,ql,qr));
}

int main() {
	scanf("%d",&n);
	scanf("%s",s+1);
	scanf("%d",&q);
	build(1,1,n);
	while (q--) {
		int l,r;
		scanf("%d%d",&l,&r);
		printf("%d\n",r-l+1-get(1,1,n,l,r).f);
	}	
}

컴파일 시 표준 에러 (stderr) 메시지

election.cpp: In function 'void build(int, int, int)':
election.cpp:46:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   46 |   int md=l+r>>1;
      |          ~^~
election.cpp: In function 'node get(int, int, int, int, int)':
election.cpp:55:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |  int md=l+r>>1;
      |         ~^~
election.cpp: In function 'int main()':
election.cpp:60:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
election.cpp:61:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |  scanf("%s",s+1);
      |  ~~~~~^~~~~~~~~~
election.cpp:62:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |  scanf("%d",&q);
      |  ~~~~~^~~~~~~~~
election.cpp:66:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |   scanf("%d%d",&l,&r);
      |   ~~~~~^~~~~~~~~~~~~~

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