Submission #1039822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1039822		c2zi6	Horses (IOI15_horses)	C++14	54 / 100	1563 ms	33876 KiB

horses

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define all(a) (a).begin(), (a).end()
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef vector<VI> VVI;
typedef vector<VVI> VVVI;
typedef vector<VPI> VVPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
typedef vector<VL> VVL;
typedef vector<VVL> VVVL;
typedef vector<VPL> VVPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template<typename T>
using indset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#include "horses.h"

const ll MOD = 1e9 + 7;

struct SEGTREE {
    int n;
    VL tree;
    SEGTREE(){}
    SEGTREE(int sz) {
        n = 1;
        while (n < sz) n *= 2;
        tree = VL(2*n);
    }
    void upd(int N, int L, int R, int i, int s) {
        if (i < L || i > R) return;
        if (L == R) {
            tree[N] = s;
            return;
        }
        int M = (L + R) / 2;
        upd(2*N+1, L, M, i, s);
        upd(2*N+2, M+1, R, i, s);
        tree[N] = tree[2*N+1] * tree[2*N+2] % MOD;
    }
    int get(int N, int L, int R, int l, int r) {
        if (l <= L && R <= r) return tree[N];
        if (R < l || L > r) return 1;
        int M = (L + R) / 2;
        return 1ll * get(2*N+1, L, M, l, r) * get(2*N+2, M+1, R, l, r) % MOD;
    }
    void upd(int i, int s) {
        upd(0, 0, n-1, i, s);
    }
    int get(int l, int r) {
        return get(0, 0, n-1, l, r);
    }
} seg;

int n;
VL a, b;

ll recalc() {
    ll leave = n-1;
    ll prod = 1;
    reprl(i, n-1, 0) {
        if (b[i] > prod) {
            prod = a[i] * b[i];
            leave = i;
        } else {
            prod = a[i] * prod;
        }
        if (prod > 1e9) break;
    }
	return seg.get(0, leave) * b[leave] % MOD;
}

int init(int N, int X[], int Y[]) {
    n = N;
    a = b = VL(n);
    rep(i, n) {
        a[i] = X[i];
        b[i] = Y[i];
    }
    seg = SEGTREE(n);
    rep(i, n) seg.upd(i, a[i]);
    return recalc();
}

int updateX(int pos, int val) {	
    a[pos] = val;
    seg.upd(pos, a[pos]);
	return recalc();
}

int updateY(int pos, int val) {
    b[pos] = val;
	return recalc();
}

Compilation message (stderr)

horses.cpp: In member function 'int SEGTREE::get(int, int, int, int, int)':
horses.cpp:57:44: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} to 'int' may change value [-Wconversion]
   57 |         if (l <= L && R <= r) return tree[N];
      |                                            ^
horses.cpp:60:72: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
   60 |         return 1ll * get(2*N+1, L, M, l, r) * get(2*N+2, M+1, R, l, r) % MOD;
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'll recalc()':
horses.cpp:83:13: warning: conversion from 'll' {aka 'long long int'} to 'double' may change value [-Wconversion]
   83 |         if (prod > 1e9) break;
      |             ^~~~
horses.cpp:85:20: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   85 |  return seg.get(0, leave) * b[leave] % MOD;
      |                    ^~~~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:96:30: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} to 'int' may change value [-Wconversion]
   96 |     rep(i, n) seg.upd(i, a[i]);
      |                              ^
horses.cpp:97:18: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
   97 |     return recalc();
      |            ~~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:102:24: warning: conversion from '__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type' {aka 'long long int'} to 'int' may change value [-Wconversion]
  102 |     seg.upd(pos, a[pos]);
      |                        ^
horses.cpp:103:15: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  103 |  return recalc();
      |         ~~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:108:15: warning: conversion from 'll' {aka 'long long int'} to 'int' may change value [-Wconversion]
  108 |  return recalc();
      |         ~~~~~~^~

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