Submission #513848

#	Time	Username	Problem	Language	Result	Execution time	Memory
513848		sliviu	Horses (IOI15_horses)	C++14	100 / 100	320 ms	70084 KiB

horses

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

using namespace std;

const int mod = 1e9 + 7;
int n, curx = 1, x[1 << 19], y[1 << 19], curinv;
long  double rcurx = 0, rcurinv;

struct node {
	int val = 1, lazy = 1;
	long double rval, rlazy;
} st[1 << 20];

void Build(int node = 1, int left = 1, int right = n) {
	if (left == right) {
		st[node].val = 1LL * (curx = (1LL * curx * x[left - 1] % mod)) * y[left - 1] % mod;
		st[node].rval = (rcurx += log(x[left - 1])) + log(y[left - 1]);
		return;
	}
	int m = (left + right) / 2;
	Build(2 * node, left, m), Build(2 * node + 1, m + 1, right);
	if (st[2 * node].rval > st[2 * node + 1].rval)
		st[node].rval = st[2 * node].rval, st[node].val = st[2 * node].val;
	else
		st[node].rval = st[2 * node + 1].rval, st[node].val = st[2 * node + 1].val;
}

void Propagate(int node, int left, int right) {
	if (st[node].lazy == 1)
		return;
	st[node].val = 1LL * st[node].val * st[node].lazy % mod;
	st[node].rval += st[node].rlazy;
	if (left != right) {
		st[2 * node].lazy = 1LL * st[2 * node].lazy * st[node].lazy % mod, st[2 * node].rlazy += st[node].rlazy;
		st[2 * node + 1].lazy = 1LL * st[2 * node + 1].lazy * st[node].lazy % mod, st[2 * node + 1].rlazy += st[node].rlazy;
	}
	st[node].lazy = 1, st[node].rlazy = 0;
}

void Update(int val, long  double rval, int posleft, int posright = n, int node = 1, int left = 1, int right = n) {
	if (posleft <= left && right <= posright) {
		st[node].lazy = 1LL * st[node].lazy * val % mod;
		st[node].rlazy += rval;
		Propagate(node, left, right);
		return;
	}
	Propagate(node, left, right);
	int m = (left + right) / 2;
	if (posleft <= m)
		Update(val, rval, posleft, posright, 2 * node, left, m), Propagate(2 * node + 1, m + 1, right);
	if (posright > m)
		Update(val, rval, posleft, posright, 2 * node + 1, m + 1, right), Propagate(2 * node, left, m);
	if (st[2 * node].rval > st[2 * node + 1].rval)
		st[node].rval = st[2 * node].rval, st[node].val = st[2 * node].val;
	else
		st[node].rval = st[2 * node + 1].rval, st[node].val = st[2 * node + 1].val;
}

int pow(int b, int e) {
	int ans = 1;
	while (e) {
		if (e & 1)
			ans = 1LL * ans * b % mod;
		b = 1LL * b * b % mod, e >>= 1;
	}
	return ans;
}

int init(int N, int X[], int Y[]) {
	n = N;
	for (int i = 0; i < n; ++i)
		x[i] = X[i], y[i] = Y[i];
	Build();
	return st[1].val;
}

int updateX(int pos, int val) {
	Update(1LL * val * pow(x[pos], mod - 2) % mod, log(val) - log(x[pos]), pos + 1);
	x[pos] = val;
	return st[1].val;
}

int updateY(int pos, int val) {
	Update(1LL * val * pow(y[pos], mod - 2) % mod, log(val) - log(y[pos]), pos + 1, pos + 1);
	y[pos] = val;
	return st[1].val;
}

Compilation message (stderr)

horses.cpp: In function 'void Build(int, int, int)':
horses.cpp:17:58: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   17 |   st[node].val = 1LL * (curx = (1LL * curx * x[left - 1] % mod)) * y[left - 1] % mod;
      |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
horses.cpp:17:80: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   17 |   st[node].val = 1LL * (curx = (1LL * curx * x[left - 1] % mod)) * y[left - 1] % mod;
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'void Propagate(int, int, int)':
horses.cpp:32:52: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   32 |  st[node].val = 1LL * st[node].val * st[node].lazy % mod;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:35:63: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   35 |   st[2 * node].lazy = 1LL * st[2 * node].lazy * st[node].lazy % mod, st[2 * node].rlazy += st[node].rlazy;
      |                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:36:71: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   36 |   st[2 * node + 1].lazy = 1LL * st[2 * node + 1].lazy * st[node].lazy % mod, st[2 * node + 1].rlazy += st[node].rlazy;
      |                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'void Update(int, long double, int, int, int, int, int)':
horses.cpp:43:45: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   43 |   st[node].lazy = 1LL * st[node].lazy * val % mod;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int pow(int, int)':
horses.cpp:64:24: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   64 |    ans = 1LL * ans * b % mod;
      |          ~~~~~~~~~~~~~~^~~~~
horses.cpp:65:19: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   65 |   b = 1LL * b * b % mod, e >>= 1;
      |       ~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:79:42: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   79 |  Update(1LL * val * pow(x[pos], mod - 2) % mod, log(val) - log(x[pos]), pos + 1);
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:85:42: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   85 |  Update(1LL * val * pow(y[pos], mod - 2) % mod, log(val) - log(y[pos]), pos + 1, pos + 1);
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~

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