제출 #206939

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
206939		oscarsierra12	말 (IOI15_horses)	C++14	17 / 100	1511 ms	52392 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>

#define ff       first
#define ss       second
#define pb       push_back

using namespace std ;

typedef long long     ll ;
typedef pair<ll, pair<ll,ll>> iii ;

const ll N = 1e7 ;
const ll o = 5e5+2 ;
const ll mod = 1e9+7 ;

ll lft[N], rg[N];
ll mx[N], mult[N] ;
ll supMod[N] ;
ll cntNode = 0 ;
ll arx[o], ary[o] ;
ll n ;

void build ( ll nod, ll l, ll r ) {
    ll mid = (l+r)/2 ;
    if ( l == r ) {
        mx [nod] = ary[l] ;
        mult [nod] = arx[l] ;
        supMod[nod] = 0 ;
        return ;
    }
    build ( lft[nod] = ++cntNode , l, mid ) ;
    build ( rg[nod] = ++cntNode , mid+1, r ) ;
    mx[nod] = max ( mx[lft[nod]], mx[rg[nod]] ) ;
    mult[nod] = mult[lft[nod]] * mult[rg[nod]] ;
    if ( mult[nod] > mod ) supMod[nod] = 1 ;
    else supMod[nod] = (supMod[lft[nod]] || supMod[rg[nod]]) ;
    mult[nod] %= mod ;
}

void update ( ll nod, ll l, ll r, ll a, ll x, ll y ) {
    ll mid = (l+r)/2 ;
    if ( l == a && r == a ) {
        mx[nod] = y ;
        mult[nod] = x ;
        return ;
    }
    if ( a <= mid ) update ( lft[nod], l, mid, a, x, y ) ;
    else update ( rg[nod], mid+1, r, a, x, y ) ;
    mx[nod] = max ( mx[lft[nod]], mx[rg[nod]] ) ;
    mult[nod] = mult[lft[nod]] * mult[rg[nod]] ;
    if ( mult[nod] > mod ) supMod[nod] = 1 ;
    else supMod[nod] = (supMod[lft[nod]] || supMod[rg[nod]]) ;
    mult[nod] %= mod ;
}

iii query ( ll nod, ll l, ll r, ll a, ll b ) {
    ll mid = (l+r)/2 ;
    if ( a > b ) return {1,{1,1}};
    if ( l == a && r == b ) return {mx[nod], {mult[nod], supMod[nod]}} ;
    if ( b <= mid ) return query ( lft[nod], l, mid, a, b ) ;
    if ( a > mid ) return query ( rg[nod], mid+1, r, a, b ) ;
    iii L = query ( lft[nod], l, mid, a, mid ) ;
    iii R = query ( rg[nod], mid+1, r, mid+1, b ) ;
    return {max (L.ff, R.ff), {1ll*(L.ss.ff * R.ss.ff)%mod, (L.ss.ff * R.ss.ff > mod || L.ss.ss || R.ss.ss )}};
}

ll solve () {
    ll l = 0, r = n-1 ;
    while ( l < r ) {
        ll mid = (l+r) / 2 ;
        if ( query(0,0,n-1,mid,n-1).ss.ss ) l = mid+1 ;
        else r = mid ;
    }
    ll ans = query(0,0,n-1,0,l-1).ss.ff ;
    ll lst = l-1 ;
    ll psb = (l?1ll*arx[l-1] * ary[l-1]:0) ;
    ll best = 0, cur = 1 ;
    ll bg = l ;
    while ( bg < n ) {
        l = bg, r = n ;
        while ( l < r ) {
            ll mid = (l+r)/2 ;
            if ( query(0,0,n-1,bg,mid).ss.ff == arx[bg] ) l = mid+1 ;
            else r = mid ;
        }
        best = max ( best, cur * query(0,0,n-1,bg,l-1).ff * arx[bg] ) ;
        cur *= arx[bg] ;
        bg = l ;
    }
    if ( psb > best ) return (ans*ary[lst])%mod ;
    best %= mod ;
    return (ans*best)%mod ;
}

int init(int Ne, int X[], int Y[]) {
    for ( ll i = 0 ; i < Ne; ++i )
        arx[i] = X[i], ary[i] = Y[i] ;
    n = Ne ;
    build ( 0,0,n-1 ) ;
    return solve();
}

int updateX(int pos, int val) {
    update ( 0,0,n-1,pos,val,ary[pos]) ;
    arx[pos] = val ;
	return solve();
}

int updateY(int pos, int val) {
    update ( 0,0,n-1,pos,arx[pos],val) ;
    ary[pos] = val ;
	return solve();
}

컴파일 시 표준 에러 (stderr) 메시지

horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:101:17: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
     return solve();
            ~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:107:14: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return solve();
         ~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:113:14: warning: conversion to 'int' from 'll {aka long long int}' may alter its value [-Wconversion]
  return solve();
         ~~~~~^~

• Subtask 1: 17 / 17
• Subtask 2: 0 / 17
• Subtask 3: 0 / 20
• Subtask 4: 0 / 23
• Subtask 5: 0 / 23