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답안 #238067

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
238067 2020-06-09T21:27:26 Z Kubin 말 (IOI15_horses) C++11
100 / 100
 363 ms 48376 KB 
#include <bits/stdc++.h>

using namespace std;

size_t n;
uint X[1 << 19], Y[1 << 19];
uint64_t product = 1;
set<size_t> idx;

const uint MOD = 1e9 + 7;
uint power(uint a, uint b)
{
    uint r = 1;
    while(b)
    {
        if(b % 2) r = (uint64_t) r * a % MOD;
        a = (uint64_t) a * a % MOD;
        b /= 2;
    }
    return r;
}
uint inverse(uint x) { return power(x, MOD - 2); }

struct segment_tree
{
    const size_t w = 1 << 19;
    uint values[1 << 20];
    void set(size_t pos, uint val)
    {
        values[pos += w] = val;
        while(pos /= 2)
            values[pos] = max(values[2*pos], values[2*pos+1]);
    }

    uint get(size_t l, size_t r)
    {
        uint result = 0;
        for(l += w, r += w; l < r; l /= 2, r /= 2)
        {
            if(l % 2) result = max(result, values[l++]);
            if(r % 2) result = max(result, values[--r]);
        }
        return result;
    }
} treeY;

uint maxY(size_t l, size_t r)
{
    return treeY.get(l, r);
}

uint compute()
{
    uint64_t yj = Y[n-1], li = 1, lj = 1;
    for(auto it = --idx.end(); *it > 0 and li < UINT_MAX; )
    {
        auto i = *it, i1 = *prev(it);
        auto yi = maxY(i1, i);
        if(yj * li < yi * lj)
            yj = yi, lj = li;
        li *= X[i1];
        it = prev(it);
    }

    return product * inverse(lj) % MOD * yj % MOD;
}

int init(int _n, int x[], int y[])
{
    n = _n;
    copy(x, x + n, X);
    copy(y, y + n, Y);
    for(size_t i = 0; i < n; i++)
    {
        product = product * X[i] % MOD;
        if(X[i] > 1) idx.insert(i);
        treeY.set(i, Y[i]);
    }
    idx.insert(0); idx.insert(n);
    X[n] = 1;
    return compute();
}

int updateX(int pos, int val)
{
    product = product * inverse(X[pos]) % MOD * val % MOD;
    if(pos and X[pos] > 1) idx.erase(pos);
    if(val > 1)            idx.insert(pos);
    X[pos] = val;
    return compute();
}

int updateY(int pos, int val)
{
    Y[pos] = val;
    treeY.set(pos, val);
    return compute();
}

Compilation message

horses.cpp: In function 'uint power(uint, uint)':
horses.cpp:16:40: warning: conversion to 'uint {aka unsigned int}' from 'uint64_t {aka long unsigned int}' may alter its value [-Wconversion]
         if(b % 2) r = (uint64_t) r * a % MOD;
                       ~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:17:30: warning: conversion to 'uint {aka unsigned int}' from 'uint64_t {aka long unsigned int}' may alter its value [-Wconversion]
         a = (uint64_t) a * a % MOD;
             ~~~~~~~~~~~~~~~~~^~~~~
horses.cpp: In function 'uint compute()':
horses.cpp:65:32: warning: conversion to 'uint {aka unsigned int}' from 'uint64_t {aka long unsigned int}' may alter its value [-Wconversion]
     return product * inverse(lj) % MOD * yj % MOD;
                                ^
horses.cpp:65:45: warning: conversion to 'uint {aka unsigned int}' from 'uint64_t {aka long unsigned int}' may alter its value [-Wconversion]
     return product * inverse(lj) % MOD * yj % MOD;
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 5 ms 384 KB Output is correct
9 Correct 4 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 5 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 5 ms 384 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 5 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 6 ms 512 KB Output is correct
27 Correct 6 ms 384 KB Output is correct
28 Correct 5 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 6 ms 512 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 225 ms 36600 KB Output is correct
2 Correct 313 ms 36600 KB Output is correct
3 Correct 330 ms 36612 KB Output is correct
4 Correct 360 ms 36600 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 4 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 5 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 4 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 4 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 4 ms 384 KB Output is correct
21 Correct 5 ms 384 KB Output is correct
22 Correct 4 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 5 ms 512 KB Output is correct
26 Correct 5 ms 512 KB Output is correct
27 Correct 5 ms 384 KB Output is correct
28 Correct 5 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 5 ms 512 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 512 KB Output is correct
33 Correct 53 ms 12280 KB Output is correct
34 Correct 54 ms 12408 KB Output is correct
35 Correct 195 ms 35704 KB Output is correct
36 Correct 198 ms 35704 KB Output is correct
37 Correct 54 ms 12280 KB Output is correct
38 Correct 104 ms 24184 KB Output is correct
39 Correct 46 ms 12152 KB Output is correct
40 Correct 182 ms 41720 KB Output is correct
41 Correct 46 ms 14328 KB Output is correct
42 Correct 48 ms 14292 KB Output is correct
43 Correct 173 ms 41976 KB Output is correct
44 Correct 182 ms 41952 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 5 ms 384 KB Output is correct
8 Correct 4 ms 384 KB Output is correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 4 ms 384 KB Output is correct
11 Correct 4 ms 384 KB Output is correct
12 Correct 4 ms 384 KB Output is correct
13 Correct 5 ms 384 KB Output is correct
14 Correct 5 ms 384 KB Output is correct
15 Correct 5 ms 384 KB Output is correct
16 Correct 4 ms 384 KB Output is correct
17 Correct 4 ms 384 KB Output is correct
18 Correct 5 ms 384 KB Output is correct
19 Correct 4 ms 384 KB Output is correct
20 Correct 5 ms 384 KB Output is correct
21 Correct 4 ms 384 KB Output is correct
22 Correct 5 ms 384 KB Output is correct
23 Correct 5 ms 384 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 6 ms 512 KB Output is correct
26 Correct 5 ms 512 KB Output is correct
27 Correct 6 ms 512 KB Output is correct
28 Correct 5 ms 512 KB Output is correct
29 Correct 5 ms 384 KB Output is correct
30 Correct 6 ms 512 KB Output is correct
31 Correct 5 ms 384 KB Output is correct
32 Correct 5 ms 384 KB Output is correct
33 Correct 216 ms 36600 KB Output is correct
34 Correct 320 ms 36728 KB Output is correct
35 Correct 285 ms 36728 KB Output is correct
36 Correct 363 ms 36732 KB Output is correct
37 Correct 53 ms 12280 KB Output is correct
38 Correct 55 ms 12280 KB Output is correct
39 Correct 205 ms 35668 KB Output is correct
40 Correct 194 ms 35704 KB Output is correct
41 Correct 55 ms 12280 KB Output is correct
42 Correct 106 ms 24312 KB Output is correct
43 Correct 44 ms 12160 KB Output is correct
44 Correct 182 ms 41720 KB Output is correct
45 Correct 45 ms 14328 KB Output is correct
46 Correct 48 ms 14328 KB Output is correct
47 Correct 177 ms 42176 KB Output is correct
48 Correct 178 ms 41980 KB Output is correct
49 Correct 113 ms 19320 KB Output is correct
50 Correct 112 ms 19320 KB Output is correct
51 Correct 267 ms 48376 KB Output is correct
52 Correct 250 ms 47996 KB Output is correct
53 Correct 147 ms 17528 KB Output is correct
54 Correct 169 ms 31108 KB Output is correct
55 Correct 105 ms 15224 KB Output is correct
56 Correct 244 ms 43384 KB Output is correct
57 Correct 94 ms 15992 KB Output is correct
58 Correct 118 ms 16368 KB Output is correct
59 Correct 179 ms 42160 KB Output is correct