Submission #361028

#	Time	Username	Problem	Language	Result	Execution time	Memory
361028		beksultan04	Meetings (IOI18_meetings)	C++14	17 / 100	163 ms	12524 KiB

meetings

#include "meetings.h"
#ifndef EVAL
#include "grader.cpp"
#endif // EVAL
#include <bits/stdc++.h>
using namespace std;
#define lol long long
#define pii pair<int,int>
#define OK puts("OK");
#define NO puts("NO");
#define YES puts("YES");
#define fr first
#define sc second
#define ret return
#define scanl(a) scanf("%lld",&a);
#define scanll(a,b) scanf("%lld %lld",&a, &b);
#define scanlll(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);
#define scan1(a) scanf("%d",&a);
#define scan2(a,b) scanf("%d %d",&a, &b);
#define scan3(a,b,c) scanf("%d %d %d",&a,&b,&c);
#define all(s) s.begin(),s.end()
#define allr(s) s.rbegin(),s.rend()
#define pb push_back
#define sz(v) (int)v.size()
#define endi puts("");
#define eps 1e-12

lol dis[1001001],mx[1001001],q[1001001];

struct node{
    lol ans,pref,suff,sz;
}der[1001001];

node merg(node a,node b){
    node ans ;
    ans.pref = a.pref;
    ans.suff = b.suff;
    ans.ans = max(a.suff+b.pref,max(a.ans,b.ans));
    if (b.sz == b.suff){
        ans.suff += a.suff;
    }
    if (a.sz == a.pref){
        ans.pref += b.pref;
    }
    ans.sz = a.sz+b.sz;
    ret ans;
}

void build(int v,int l,int r){
    if (l == r){
        der[v].pref = (q[l] == 1);
        der[v].suff = (q[l] == 1);
        der[v].ans = (q[l] == 1);
        der[v].sz = 1;
    }
    else {
        int m = l+r>>1;
        build(v<<1,l,m);
        build((v<<1)+1,m+1,r);
        der[v] = merg(der[v<<1],der[(v<<1)+1]);
    }
}

node getLR(int v,int l,int r,int ql,int qr){
    node ans;
    ans.ans = 0;
    ans.pref = 0;
    ans.suff = 0;
    if (l > qr || r < ql)ret ans;
    if (ql <= l && r <= qr)ret der[v];
    else {
        int m = l+r>>1;
        ans = merg(getLR(v<<1,l,m,ql,qr),getLR((v<<1)+1,m+1,r,ql,qr));
        ret ans;
    }
}


vector<lol> minimum_costs(vector<int> H, vector<int> L,vector<int> R) {
    int i,j,k,n = H.size(),Q = L.size();
    vector<lol> C(Q);
    for (i=0;i<n;++i)q[i] = H[i];
    build(1,0,n-1);
    for (i=0;i<Q;++i){
        node x = getLR(1,0,n-1,L[i],R[i]);
        lol s = R[i]-L[i]+1;
        C[i] = (s-x.ans)*2;
        C[i] += x.ans;
    }

    ret C;
}

Compilation message (stderr)

meetings.cpp: In function 'void build(int, int, int)':
meetings.cpp:57:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   57 |         int m = l+r>>1;
      |                 ~^~
meetings.cpp: In function 'node getLR(int, int, int, int, int)':
meetings.cpp:72:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   72 |         int m = l+r>>1;
      |                 ~^~
meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:80:11: warning: unused variable 'j' [-Wunused-variable]
   80 |     int i,j,k,n = H.size(),Q = L.size();
      |           ^
meetings.cpp:80:13: warning: unused variable 'k' [-Wunused-variable]
   80 |     int i,j,k,n = H.size(),Q = L.size();
      |             ^

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 17 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40