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답안 #62417

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
62417 2018-07-28T11:59:44 Z Tenuun 말 (IOI15_horses) C++17
100 / 100
 627 ms 43024 KB 
#include<bits/stdc++.h>
#define mod 1000000007
#define ll long long

using namespace std;

int n, tr[2000000], id[500001];
ll bit[500001];
ll now=1;
vector<int>x, y;
set<int>a;

void update(int ind, int val){
	if(ind==0) return;
    while(ind<=500000){
        bit[ind]*=val;
        bit[ind]%=mod;
        ind+=ind&-ind;
    }
}

ll get(int ind){
    if(ind<0 || ind>n) return 1;
    ll ans=1;
    while(ind>0){
        ans*=bit[ind];
        ans%=mod;
        ind-=ind&-ind;
    }
    return ans;
}

void pre(){
    fill(bit, bit+500001, 1);
    a.insert(-1);
    a.insert(0);
    for(int i=0; i<n; i++){
        if(x[i]>1){
            a.insert(i);
            update(i+1, x[i]);
        }
    }
}

void build(int ind, int l, int r){
    if(l==r){
        tr[ind]=y[l];
        id[l]=ind;
        return;
    }
    build(ind*2, l, (l+r)/2);
    build(ind*2+1, (l+r)/2+1, r);
    tr[ind]=max(tr[ind*2], tr[ind*2+1]);
}

void upd(int ind){
    if(ind==0) return;
    tr[ind]=max(tr[ind*2], tr[ind*2+1]);
    upd(ind/2);
}

ll rmq(int ind, int l, int r, int L, int R){
    if(l==L && r==R) return tr[ind];
    int m=(l+r)/2;
    if(R<=m) return rmq(ind*2, l, m, L, R);
    else if(L>m) return rmq(ind*2+1, m+1, r, L, R);
    else{
        return max(rmq(ind*2, l, m, L, m), rmq(ind*2+1, m+1, r, m+1, R));
    }
}

ll find(){
	if(a.size()==1){
		return rmq(1, 0, n-1, 0, n-1);
	}
    ll ans=1, t=rmq(1, 0, n-1, *prev(a.end()), n-1);
    ll now=t;
    set<int>::iterator it;
    for(it=prev(a.end()); it!=a.begin() && now<mod; it--){
        if(now*x[*it]>mod) {
            break;
        }
        now*=x[*it];
    }
    ans=now%mod;
    now/=t;
    for(set<int>::iterator tmp=prev((prev(a.end()))); tmp!=prev(it) && tmp!=a.begin(); tmp--){
        now/=x[*next(tmp)];
        ans=max(ans, now*rmq(1, 0, n-1, *tmp, *next(tmp)-1));
    }
    ans%=mod;
    if(it!=a.begin()) {
    	ans*=get(*it+1);
    }
    ans%=mod;
    return ans;
}

int init(int N, int X[], int Y[]) {
    n=N;
    for(int i=0; i<n; i++) {x.push_back(X[i]); y.push_back(Y[i]);}
    pre();
    build(1, 0, n-1);
    return find();
}

ll pw(ll o, ll p){
    if(p==0) return 1;
    ll ans=pw(o, p/2);
    ans*=ans;
    ans%=mod;
    if(p%2) ans*=o;
    ans%=mod;
    return ans;
}

int updateX(int pos, int val){
    if(x[pos]==1 && val==1) return find();
    if(x[pos]>1 && val>1){
        update(pos+1, (val*pw(x[pos], mod-2)%mod));
        x[pos]=val;
        return find();
    }
    if(x[pos]==1){
        a.insert(pos);
        update(pos+1, val);
        x[pos]=val;
    }
    else{
        a.erase(a.find(pos));
        update(pos+1, pw(x[pos], mod-2));
        x[pos]=1;
    }
    return find();
}

int updateY(int pos, int val){
    tr[id[pos]]=val;
    upd(id[pos]/2);
    return find();
}

Compilation message

horses.cpp: In function 'long long int find()':
horses.cpp:77:8: warning: declaration of 'now' shadows a global declaration [-Wshadow]
     ll now=t;
        ^~~
horses.cpp:9:4: note: shadowed declaration is here
 ll now=1;
    ^~~
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:104:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return find();
            ~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:118:40: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     if(x[pos]==1 && val==1) return find();
                                    ~~~~^~
horses.cpp:120:45: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         update(pos+1, (val*pw(x[pos], mod-2)%mod));
                       ~~~~~~~~~~~~~~~~~~~~~~^~~~~
horses.cpp:122:20: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         return find();
                ~~~~^~
horses.cpp:131:25: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
         update(pos+1, pw(x[pos], mod-2));
                       ~~^~~~~~~~~~~~~~~
horses.cpp:134:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return find();
            ~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:140:16: warning: conversion to 'int' from 'long long int' may alter its value [-Wconversion]
     return find();
            ~~~~^~

Subtask #1
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 4216 KB Output is correct
2 Correct 6 ms 4328 KB Output is correct
3 Correct 6 ms 4328 KB Output is correct
4 Correct 7 ms 4328 KB Output is correct
5 Correct 5 ms 4328 KB Output is correct
6 Correct 8 ms 4412 KB Output is correct
7 Correct 6 ms 4412 KB Output is correct
8 Correct 7 ms 4428 KB Output is correct
9 Correct 6 ms 4440 KB Output is correct
10 Correct 7 ms 4440 KB Output is correct
11 Correct 5 ms 4440 KB Output is correct
12 Correct 5 ms 4440 KB Output is correct
13 Correct 5 ms 4440 KB Output is correct
14 Correct 6 ms 4440 KB Output is correct
15 Correct 7 ms 4440 KB Output is correct
16 Correct 7 ms 4516 KB Output is correct
17 Correct 7 ms 4564 KB Output is correct
18 Correct 7 ms 4564 KB Output is correct
19 Correct 7 ms 4564 KB Output is correct
20 Correct 5 ms 4564 KB Output is correct

Subtask #2
17.0 / 17.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 4564 KB Output is correct
2 Correct 6 ms 4564 KB Output is correct
3 Correct 6 ms 4564 KB Output is correct
4 Correct 6 ms 4564 KB Output is correct
5 Correct 6 ms 4564 KB Output is correct
6 Correct 5 ms 4564 KB Output is correct
7 Correct 6 ms 4564 KB Output is correct
8 Correct 6 ms 4564 KB Output is correct
9 Correct 6 ms 4564 KB Output is correct
10 Correct 6 ms 4564 KB Output is correct
11 Correct 6 ms 4564 KB Output is correct
12 Correct 7 ms 4564 KB Output is correct
13 Correct 6 ms 4564 KB Output is correct
14 Correct 6 ms 4564 KB Output is correct
15 Correct 7 ms 4564 KB Output is correct
16 Correct 6 ms 4564 KB Output is correct
17 Correct 6 ms 4564 KB Output is correct
18 Correct 7 ms 4564 KB Output is correct
19 Correct 6 ms 4564 KB Output is correct
20 Correct 6 ms 4564 KB Output is correct
21 Correct 5 ms 4564 KB Output is correct
22 Correct 8 ms 4564 KB Output is correct
23 Correct 7 ms 4580 KB Output is correct
24 Correct 7 ms 4580 KB Output is correct
25 Correct 9 ms 4596 KB Output is correct
26 Correct 7 ms 4684 KB Output is correct
27 Correct 10 ms 4684 KB Output is correct
28 Correct 8 ms 4684 KB Output is correct
29 Correct 7 ms 4684 KB Output is correct
30 Correct 8 ms 4684 KB Output is correct
31 Correct 7 ms 4684 KB Output is correct
32 Correct 7 ms 4684 KB Output is correct

Subtask #3
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 527 ms 42872 KB Output is correct
2 Correct 356 ms 43024 KB Output is correct
3 Correct 390 ms 43024 KB Output is correct
4 Correct 363 ms 43024 KB Output is correct

Subtask #4
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 43024 KB Output is correct
2 Correct 6 ms 43024 KB Output is correct
3 Correct 8 ms 43024 KB Output is correct
4 Correct 7 ms 43024 KB Output is correct
5 Correct 6 ms 43024 KB Output is correct
6 Correct 7 ms 43024 KB Output is correct
7 Correct 7 ms 43024 KB Output is correct
8 Correct 6 ms 43024 KB Output is correct
9 Correct 7 ms 43024 KB Output is correct
10 Correct 7 ms 43024 KB Output is correct
11 Correct 7 ms 43024 KB Output is correct
12 Correct 7 ms 43024 KB Output is correct
13 Correct 6 ms 43024 KB Output is correct
14 Correct 7 ms 43024 KB Output is correct
15 Correct 7 ms 43024 KB Output is correct
16 Correct 7 ms 43024 KB Output is correct
17 Correct 8 ms 43024 KB Output is correct
18 Correct 7 ms 43024 KB Output is correct
19 Correct 7 ms 43024 KB Output is correct
20 Correct 6 ms 43024 KB Output is correct
21 Correct 7 ms 43024 KB Output is correct
22 Correct 6 ms 43024 KB Output is correct
23 Correct 7 ms 43024 KB Output is correct
24 Correct 7 ms 43024 KB Output is correct
25 Correct 7 ms 43024 KB Output is correct
26 Correct 7 ms 43024 KB Output is correct
27 Correct 9 ms 43024 KB Output is correct
28 Correct 7 ms 43024 KB Output is correct
29 Correct 6 ms 43024 KB Output is correct
30 Correct 7 ms 43024 KB Output is correct
31 Correct 7 ms 43024 KB Output is correct
32 Correct 8 ms 43024 KB Output is correct
33 Correct 48 ms 43024 KB Output is correct
34 Correct 60 ms 43024 KB Output is correct
35 Correct 341 ms 43024 KB Output is correct
36 Correct 288 ms 43024 KB Output is correct
37 Correct 91 ms 43024 KB Output is correct
38 Correct 168 ms 43024 KB Output is correct
39 Correct 47 ms 43024 KB Output is correct
40 Correct 280 ms 43024 KB Output is correct
41 Correct 52 ms 43024 KB Output is correct
42 Correct 61 ms 43024 KB Output is correct
43 Correct 285 ms 43024 KB Output is correct
44 Correct 278 ms 43024 KB Output is correct

Subtask #5
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 43024 KB Output is correct
2 Correct 6 ms 43024 KB Output is correct
3 Correct 6 ms 43024 KB Output is correct
4 Correct 6 ms 43024 KB Output is correct
5 Correct 7 ms 43024 KB Output is correct
6 Correct 7 ms 43024 KB Output is correct
7 Correct 6 ms 43024 KB Output is correct
8 Correct 6 ms 43024 KB Output is correct
9 Correct 7 ms 43024 KB Output is correct
10 Correct 7 ms 43024 KB Output is correct
11 Correct 8 ms 43024 KB Output is correct
12 Correct 7 ms 43024 KB Output is correct
13 Correct 8 ms 43024 KB Output is correct
14 Correct 6 ms 43024 KB Output is correct
15 Correct 7 ms 43024 KB Output is correct
16 Correct 6 ms 43024 KB Output is correct
17 Correct 7 ms 43024 KB Output is correct
18 Correct 6 ms 43024 KB Output is correct
19 Correct 6 ms 43024 KB Output is correct
20 Correct 7 ms 43024 KB Output is correct
21 Correct 6 ms 43024 KB Output is correct
22 Correct 7 ms 43024 KB Output is correct
23 Correct 7 ms 43024 KB Output is correct
24 Correct 7 ms 43024 KB Output is correct
25 Correct 9 ms 43024 KB Output is correct
26 Correct 8 ms 43024 KB Output is correct
27 Correct 12 ms 43024 KB Output is correct
28 Correct 9 ms 43024 KB Output is correct
29 Correct 8 ms 43024 KB Output is correct
30 Correct 9 ms 43024 KB Output is correct
31 Correct 4 ms 43024 KB Output is correct
32 Correct 12 ms 43024 KB Output is correct
33 Correct 627 ms 43024 KB Output is correct
34 Correct 453 ms 43024 KB Output is correct
35 Correct 439 ms 43024 KB Output is correct
36 Correct 411 ms 43024 KB Output is correct
37 Correct 64 ms 43024 KB Output is correct
38 Correct 58 ms 43024 KB Output is correct
39 Correct 317 ms 43024 KB Output is correct
40 Correct 306 ms 43024 KB Output is correct
41 Correct 85 ms 43024 KB Output is correct
42 Correct 190 ms 43024 KB Output is correct
43 Correct 59 ms 43024 KB Output is correct
44 Correct 320 ms 43024 KB Output is correct
45 Correct 62 ms 43024 KB Output is correct
46 Correct 113 ms 43024 KB Output is correct
47 Correct 304 ms 43024 KB Output is correct
48 Correct 279 ms 43024 KB Output is correct
49 Correct 162 ms 43024 KB Output is correct
50 Correct 149 ms 43024 KB Output is correct
51 Correct 402 ms 43024 KB Output is correct
52 Correct 351 ms 43024 KB Output is correct
53 Correct 467 ms 43024 KB Output is correct
54 Correct 245 ms 43024 KB Output is correct
55 Correct 138 ms 43024 KB Output is correct
56 Correct 428 ms 43024 KB Output is correct
57 Correct 285 ms 43024 KB Output is correct
58 Correct 370 ms 43024 KB Output is correct
59 Correct 279 ms 43024 KB Output is correct