제출 #773180

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
773180		1ne	말 (IOI15_horses)	C++14	17 / 100	109 ms	41584 KiB

horses

#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
vector<long long>cur;
const int mod = 1e9 + 7;
long long inf = 1e9 + 5;
vector<long long>x,y;
long long ans = 1;
struct dataa{
	long long vx = 1,vy = 1,ans = 1;
	void add(long long left,long long right,long long val,int op){
		if (op == 1){
			vx = val;
		} 
		else{
			vy = val;
		}
		ans = vx * vy;
		//sum += val *(right - left + 1);
	}
};
long long power(long long a,long long b){
        
     long long result =1;
       while(b>0){
         if(b&1)result=(result*a)%mod; //if you want you can add mod here!
          a=(a*a)%mod; //here also.
          b>>=1;// shifted one bit similar to divide by 2 :)
      }
 return result;}
 //if m is prime then a^n = a^(n%(mod-1));
struct Segment_Tree{
	vector<dataa>tree;
	void build(long long node,long long left,long long right,vector<long long>&arr,vector<long long>&brr,long long n){
		if (left == right){
			tree[node].vx = arr[left];
			tree[node].vy = brr[left];
			tree[node].ans = min(inf,arr[left] * brr[left]);
			return ;
		}
		long long mid = (left + right)>>1;
		long long z = node + ((mid - left + 1)<<1);
		build(node + 1,left,mid,arr,brr,n);
		build(z,mid + 1,right,arr,brr,n);
		tree[node] = combine(tree[node + 1],tree[z]);
	}
	void init(long long n,vector<long long>&arr,vector<long long>&brr){
		tree.resize(2*n - 1);
		build(0,0,n-1,arr,brr,n);
	}
	dataa combine(dataa left,dataa right){
		dataa res;
		res.vx = min(left.vx * right.vx,inf);
		res.vy = right.vy;
		res.ans = max(left.ans,min(left.vx * right.ans,inf));
		return res;
	}
	dataa query(long long node,long long left,long long right,long long qleft,long long qright){
		if (qright<left|| qleft > right)return {1,1,1};
		if (qleft<=left && qright>=right){
			return tree[node];
		}
		long long mid = (left + right)>>1;
		long long z = node + ((mid - left + 1)<<1);
		return combine(query(node + 1,left,mid,qleft,qright),query(z,mid + 1,right,qleft,qright));
	}
	void update(long long node,long long left,long long right,long long uleft,long long uright,long long v,int op){
		if (left > uright || right < uleft) return;
		if (uleft <= left && right <=uright){
			tree[node].add(left,right,v,op);
			return;
		}
		long long mid = (left + right)>>1;
		long long z = node + ((mid - left + 1)<<1);
		if (uleft<=mid){
			update(node + 1,left,mid,uleft,uright,v,op);
		}
		if (uright > mid){
			update(z,mid + 1,right,uleft,uright,v,op);
		}
		tree[node] = combine(tree[node + 1],tree[z]);
	}
};
int n;
int valid = -1;
Segment_Tree st;	
int init(int N, int X[], int Y[]) {
	cur.resize(N);
	n = N;
	for (int i = 0;i<n;++i){
		x.push_back(X[i]);
		y.push_back(Y[i]);
	}
	st.init(n,x,y);
	long long v = 1;
	for (int i = 0;i<N;++i){
		bool ok = true;
		long long u = 1;
		if (st.query(0,0,n - 1,i + 1,n - 1).ans > y[i]){
			ok = false;
		}
		v = (v * x[i])%mod;
		if (ok){
			valid = i;
			return ans = (v * y[i])%mod;
		}
	}
	return 0;	
}

int updateX(int pos, int val) {	
	if (pos <= valid){
		ans = ((ans * power(x[pos],mod - 2))%mod * val)%mod;
		x[pos] = val;		
	}
	else if (x[pos] >= val){
		x[pos] = val;	
	}
	else{
		ans = ((ans * power(y[valid],mod - 2))%mod);
		st.update(0,0,n - 1,pos,pos,val,1);
		x[pos] = val;
		while(valid < n - 1 && st.query(0,0,n - 1,valid + 1,n - 1).ans > y[valid]){
			++valid;
			ans = (ans * x[valid])%mod;
		}
		ans = (ans * y[valid])%mod;	
	}
	return ans;
}

int updateY(int pos, int val) {
	return 0;	
}

컴파일 시 표준 에러 (stderr) 메시지

horses.cpp: In member function 'void dataa::add(long long int, long long int, long long int, int)':
horses.cpp:11:21: warning: unused parameter 'left' [-Wunused-parameter]
   11 |  void add(long long left,long long right,long long val,int op){
      |           ~~~~~~~~~~^~~~
horses.cpp:11:36: warning: unused parameter 'right' [-Wunused-parameter]
   11 |  void add(long long left,long long right,long long val,int op){
      |                          ~~~~~~~~~~^~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:105:15: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  105 |    return ans = (v * y[i])%mod;
      |           ~~~~^~~~~~~~~~~~~~~~
horses.cpp:98:13: warning: unused variable 'u' [-Wunused-variable]
   98 |   long long u = 1;
      |             ^
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:129:9: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  129 |  return ans;
      |         ^~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:132:17: warning: unused parameter 'pos' [-Wunused-parameter]
  132 | int updateY(int pos, int val) {
      |             ~~~~^~~
horses.cpp:132:26: warning: unused parameter 'val' [-Wunused-parameter]
  132 | int updateY(int pos, int val) {
      |                      ~~~~^~~

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