Submission #1039820

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039820		Zicrus	Horses (IOI15_horses)	C++17	17 / 100	46 ms	23128 KiB

horses

#include <bits/stdc++.h>
#include "horses.h"
using namespace std;

typedef long long ll;

ll n, pow2;
vector<ll> segMul;
vector<bool> segOF;
vector<ll> x, y;

#define OF (1ll << 30ll)
#define MOD (1000000007)

void setX(int pos, int val) {
    x[pos] = val;
    pos += pow2;
    segMul[pos] = val;
    pos /= 2;
    while (pos) {
        segMul[pos] = segMul[2*pos] * segMul[2*pos+1];
        if (segOF[2*pos] || segOF[2*pos+1] || segMul[pos] > OF) {
            segMul[pos] %= MOD;
            segOF[pos] = true;
        }
        pos /= 2;
    }
}

int getOFId(int i = 1, ll prod = 1) {
    if (i >= pow2) return i-pow2;
    if (segOF[2*i+1] || segMul[2*i+1] * prod >= OF) return getOFId(2*i+1, prod);
    return getOFId(2*i, prod * segMul[2*i+1]);
}

int getMulMod(int i) {
    int low = pow2, high = pow2+i;
    ll res = 1;
    while (low <= high) {
        if (low & 1) res = (res * segMul[low++]) % MOD;
        if (!(high & 1)) res = (res * segMul[high--]) % MOD;
        low /= 2; high /= 2;
    }
    return res % MOD;
}

int calc() {
    ll ofId = getOFId();
    ll mx = 0;
    ll mxRes = 0;
    ll offCnt = getMulMod(ofId++);
    ll tCnt = 1;
    if (!segOF[1]) {
        offCnt = 1;
        ofId = 0;
    }
    for (int i = ofId; i < n; i++) {
        offCnt *= x[i];
        offCnt %= MOD;
        tCnt *= x[i];
        ll val = tCnt * y[i];
        if (val > mx) {
            mx = val;
            mxRes = (offCnt * y[i]) % MOD;
        }
    }
    return mxRes;
}

int init(int N, int X[], int Y[]) {
	n = N; pow2 = 1ll << (ll)ceil(log2(n));
    x = vector<ll>(n);
    y = vector<ll>(n);
    for (int i = 0; i < n; i++) {
        x[i] = X[i];
        y[i] = Y[i];
    }
    segMul = vector<ll>(2*pow2, 1);
    segOF = vector<bool>(2*pow2);
    for (int i = 0; i < n; i++) {
        segMul[pow2+i] = X[i];
    }
    for (int i = pow2-1; i > 0; i--) {
        segMul[i] = segMul[2*i] * segMul[2*i+1];
        if (segOF[2*i] || segOF[2*i+1] || segMul[i] >= OF) {
            segMul[i] %= MOD;
            segOF[i] = true;
        }
    }

    return calc();
}

int updateX(int pos, int val) {
    setX(pos, val);
	return calc();
}

int updateY(int pos, int val) {
    y[pos] = val;
	return calc();
}

Compilation message (stderr)

horses.cpp: In function 'void setX(int, int)':
horses.cpp:17:9: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   17 |     pos += pow2;
      |     ~~~~^~~~~~~
horses.cpp: In function 'int getOFId(int, ll)':
horses.cpp:31:28: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   31 |     if (i >= pow2) return i-pow2;
      |                           ~^~~~~
horses.cpp: In function 'int getMulMod(int)':
horses.cpp:37:15: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   37 |     int low = pow2, high = pow2+i;
      |               ^~~~
horses.cpp:37:32: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   37 |     int low = pow2, high = pow2+i;
      |                            ~~~~^~
horses.cpp:44:16: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   44 |     return res % MOD;
      |                ^
horses.cpp: In function 'int calc()':
horses.cpp:51:31: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   51 |     ll offCnt = getMulMod(ofId++);
      |                           ~~~~^~
horses.cpp:57:18: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   57 |     for (int i = ofId; i < n; i++) {
      |                  ^~~~
horses.cpp:67:12: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   67 |     return mxRes;
      |            ^~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:83:22: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   83 |     for (int i = pow2-1; i > 0; i--) {
      |                  ~~~~^~

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