Submission #984296

#	Time	Username	Problem	Language	Result	Execution time	Memory
984296		SmuggingSpun	말 (IOI15_horses)	C++14	100 / 100	546 ms	31624 KiB

horses

#include "horses.h"
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int mod = 1e9 + 7;
const int lim = 5e5 + 5;
int power(int a, int b){
	int ans = 1;
	for(; b > 0; b >>= 1, a = 1LL * a * a % mod){
		if(b & 1){
			ans = 1LL * ans * a % mod;
		}
	}
	return ans;
}
int n, st[lim << 2], x[lim], x_st[lim << 1], y[lim], bit[lim];
int get_bit(int p){
	int ans = 1;
	for(; p > 0; p -= p & -p){
		ans = 1LL * ans * bit[p] % mod;
	}
	return ans;
}
void update_bit(int p, int x){
	for(; p <= n; p += p & -p){
		bit[p] = 1LL * bit[p] * x % mod;
	}
}
int get_x_prod(int l, int r){
	int res = 1;
	for(l += n, r += n + 1; l < r; l >>= 1, r >>= 1){
		if(l & 1){
			res = min(ll(mod), 1LL * res * x_st[l++]);
		}
		if(r & 1){
			res = min(ll(mod), 1LL * res * x_st[--r]);
		}
	}
	return res;
}
void modify_x(int p, int X){
	update_bit(p, 1LL * power(x[p], mod - 2) * X % mod);
	x[p] = X;
	for(x_st[p += n] = X; p > 1; p >>= 1){
		x_st[p >> 1] = min(ll(mod), 1LL * x_st[p] * x_st[p ^ 1]);
	}
}
int merge(int l, int r){
	if(l == 0){
		return r;
	}
	if(r == 0){
		return l;
	}
	return 1LL * get_x_prod(l + 1, r) * y[r] < ll(y[l]) ? l : r;
}
void update_X(int id, int l, int r, int p, int X){
	if(l == r){
		modify_x(st[id] = l, X);
		return;
	}
	int m = (l + r) >> 1;
	if(m < p){
		update_X(id << 1 | 1, m + 1, r, p, X);
	}
	else{
		update_X(id << 1, l, m, p, X);
	}
	st[id] = merge(st[id << 1], st[id << 1 | 1]);
}
void update_Y(int p, int Y){
	y[p] = Y;
	int id = 1, l = 1, r = n;
	while(l < r){
		int m = (l + r) >> 1;
		id <<= 1;
		if(m < p){
			l = m + 1;
			id |= 1;
		}
		else{
			r = m;
		}
	}
	while((id >>= 1) > 0){
		st[id] = merge(st[id << 1], st[id << 1 | 1]);
	}
}
int init(int N, int X[], int Y[]){
	fill(bit, bit + lim, 1);
	fill(x_st, x_st + (lim << 1), 1);
	fill(x + 1, x + (n = N) + 1, 1);
	for(int i = 1; i <= n; i++){
		y[i] = Y[i - 1];
		update_X(1, 1, n, i, X[i - 1]);
	}
	return 1LL * get_bit(st[1]) * y[st[1]] % mod;
}
int updateX(int pos, int val){	
	update_X(1, 1, n, pos + 1, val);
	return 1LL * get_bit(st[1]) * y[st[1]] % mod;
}
int updateY(int pos, int val){
	update_Y(pos + 1, val);
	return 1LL * get_bit(st[1]) * y[st[1]] % mod;
}

Compilation message (stderr)

horses.cpp: In function 'int power(int, int)':
horses.cpp:9:40: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
    9 |  for(; b > 0; b >>= 1, a = 1LL * a * a % mod){
      |                            ~~~~~~~~~~~~^~~~~
horses.cpp:11:24: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   11 |    ans = 1LL * ans * a % mod;
      |          ~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int get_bit(int)':
horses.cpp:20:28: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   20 |   ans = 1LL * ans * bit[p] % mod;
      |         ~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'void update_bit(int, int)':
horses.cpp:24:28: warning: declaration of 'x' shadows a global declaration [-Wshadow]
   24 | void update_bit(int p, int x){
      |                        ~~~~^
horses.cpp:16:22: note: shadowed declaration is here
   16 | int n, st[lim << 2], x[lim], x_st[lim << 1], y[lim], bit[lim];
      |                      ^
horses.cpp:26:29: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   26 |   bit[p] = 1LL * bit[p] * x % mod;
      |            ~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int get_x_prod(int, int)':
horses.cpp:33:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   33 |    res = min(ll(mod), 1LL * res * x_st[l++]);
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp:36:13: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   36 |    res = min(ll(mod), 1LL * res * x_st[--r]);
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp: In function 'void modify_x(int, int)':
horses.cpp:42:47: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   42 |  update_bit(p, 1LL * power(x[p], mod - 2) * X % mod);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:45:21: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   45 |   x_st[p >> 1] = min(ll(mod), 1LL * x_st[p] * x_st[p ^ 1]);
      |                  ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:97:41: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   97 |  return 1LL * get_bit(st[1]) * y[st[1]] % mod;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:101:41: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  101 |  return 1LL * get_bit(st[1]) * y[st[1]] % mod;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:105:41: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
  105 |  return 1LL * get_bit(st[1]) * y[st[1]] % mod;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~

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