Submission #432726

#	Time	Username	Problem	Language	Result	Execution time	Memory
432726		Kevin_Zhang_TW	말 (IOI15_horses)	C++17	34 / 100	1579 ms	31528 KiB

horses

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
template<class T> void debug(T l, T r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif
#include "horses.h"

const int MAX_N = 500010, p = 1e9 + 7;
const ll inf = p;

//ll dp[MAX_N], mdp[MAX_N];

int sx[MAX_N], sy[MAX_N], n;

struct dint {
	ll val, mod_val;
	dint (ll a, ll b) : val(a), mod_val(b) {}
	dint () : val(0), mod_val(0) {}
#define fastop(op) dint &operator op (const dint &b) { val = min(inf, (val op b.val)), mod_val = val op b.val % p; return *this; }
	fastop(*=);
	fastop(+=); 
	dint operator + (const dint &b) {
		dint x = *this;
		x += b;
		return x;
	}
	dint operator * (const dint &b) {
		dint x = *this;
		x *= b;
		return x;
	} 
	bool operator < (dint b) { return val < b.val; }
//	dint &operator *= (dint b) {
//		val
};
struct node {
	ll mod_mxv, mod_mulx, lx, rx, ay;
	node(ll x, ll y) {
		mod_mxv = x * y % p;
		mod_mulx = x;
		lx = x, rx = 1;
		ay = y;
	}
	node () {
		mod_mxv = 1, mod_mulx = 1, lx = 1, rx = 1, ay = 1;
	}
	node (node a, node b) {
		if (min(inf, a.rx * b.lx) * b.ay > a.ay) {
			lx = min(inf, min(inf, a.lx * a.rx) * b.lx);
			rx = b.rx;
			ay = b.ay;
			mod_mxv = b.mod_mxv * a.mod_mulx % p;
		}
		else {
			lx = a.lx;
			rx = min(inf, min(inf, b.lx * b.rx) * a.rx);
			ay = a.ay;
			mod_mxv = a.mod_mxv;
		}
		mod_mulx = a.mod_mulx * b.mod_mulx % p;
	}
	ll get() { return mod_mxv; }
};

node dp[MAX_N];

int init(int N, int X[], int Y[]) {
	n = N;
	copy(X, X+n, sx);
	copy(Y, Y+n, sy);

	for (int i = n-1;i >= 0;--i) {
		dp[i] = node( node(sx[i], sy[i]), dp[i+1] );
	}
	return dp[0].get(); 
//	for (int i = n-1;i >= 0;--i) {
//		dp[i] = max<ll>(se[i], mu[i+1] * dp[i+1]);
//	}

}

int updateX(int pos, int val) {	
	sx[pos] = val;
	for (int i = n-1;i >= 0;--i) {
		dp[i] = node( node(sx[i], sy[i]), dp[i+1] );
	}
	return dp[0].get(); 
}

int updateY(int pos, int val) {
	sy[pos] = val;
	for (int i = n-1;i >= 0;--i) {
		dp[i] = node( node(sx[i], sy[i]), dp[i+1] );
	}
	return dp[0].get(); 
}

Compilation message (stderr)

horses.cpp: In member function 'dint& dint::operator*=(const dint&)':
horses.cpp:30:60: warning: operation on '((dint*)this)->dint::val' may be undefined [-Wsequence-point]
   30 | #define fastop(op) dint &operator op (const dint &b) { val = min(inf, (val op b.val)), mod_val = val op b.val % p; return *this; }
      |                                                        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp:31:2: note: in expansion of macro 'fastop'
   31 |  fastop(*=);
      |  ^~~~~~
horses.cpp: In member function 'dint& dint::operator+=(const dint&)':
horses.cpp:30:60: warning: operation on '((dint*)this)->dint::val' may be undefined [-Wsequence-point]
   30 | #define fastop(op) dint &operator op (const dint &b) { val = min(inf, (val op b.val)), mod_val = val op b.val % p; return *this; }
      |                                                        ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
horses.cpp:32:2: note: in expansion of macro 'fastop'
   32 |  fastop(+=);
      |  ^~~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:86:18: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   86 |  return dp[0].get();
      |         ~~~~~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:98:18: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   98 |  return dp[0].get();
      |         ~~~~~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:106:18: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  106 |  return dp[0].get();
      |         ~~~~~~~~~^~

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