| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 955699 |
2024-03-31T10:39:20 Z |
emad234 |
Horses (IOI15_horses) |
C++17 |
|
1500 ms |
48352 KB |
#include "horses.h"
#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pii pair<ll, ll>
const ll mod = 1e9 + 7;
const ll mxN = 5e5 + 5;
using namespace std;
ll NN;
struct tree
{
vector<pii> seg;
ll s, e;
void init(ll n)
{
NN = exp2(ceil(log2(n)));
seg.resize(NN * 4);
}
ll queryMax(ll l = 1, ll r = NN, ll ind = 1)
{
if (l > e || r < s)
return 0;
if (l >= s && r <= e)
return seg[ind].F;
ll md = (l + r) / 2;
return max(queryMax(l, md, ind * 2), queryMax(md + 1, r, ind * 2 + 1));
}
ll queryProd(ll l = 1, ll r = NN, ll ind = 1)
{
if (l > e || r < s)
return 1;
if (l >= s && r <= e)
return seg[ind].S;
ll md = (l + r) / 2;
return (queryProd(l, md, ind * 2) * queryProd(md + 1, r, ind * 2 + 1)) % mod;
}
void update(pii val, ll ind)
{
ind += NN;
seg[ind] = val;
while (ind /= 2)
{
seg[ind].F = max(seg[ind * 2].F, seg[ind * 2 + 1].F);
seg[ind].S = (seg[ind * 2].S * seg[ind * 2 + 1].S) % mod;
}
}
} seg;
struct ones
{
ll l, r;
friend bool operator<(ones a, ones b)
{
return a.l < b.l;
}
};
set<ones> s;
ll st[mxN],ed[mxN];
ll x[mxN], y[mxN];
ll vals[mxN];
ll n;
ll solve()
{
ll id = 0;
int i = n - 1;
while (i > 0 && id <= 70)
{
if (x[i] == 1)
{
i = st[i] - 1;
continue;;
}
i--;
id++;
}
if(i == -1) i = 0;
ll mx = -1, mxid = -1;
ll prd = 1;
for (i; i < n; i++)
{
if (x[i] == 1)
{
seg.s = i + 1, seg.e = ed[i] + 1;
if (vals[i] * prd > mx)
{
mx = vals[i];
mxid = i;
prd = 1;
}
i = ed[i];
continue;
}
if (prd * x[i] > mx)
{
mx = y[i];
mxid = i;
prd = 1;
continue;
}
prd *= x[i];
if (prd * y[i] > mx)
{
mx = y[i];
mxid = i;
prd = 1;
continue;
}
}
seg.s = 1;
seg.e = mxid + 1;
return (mx * seg.queryProd()) % mod;
}
int init(int N, int X[], int Y[])
{
seg.init(N);
n = N;
for (ll i = 0; i < N; i++)
{
y[i] = Y[i];
x[i] = X[i];
seg.update({Y[i], X[i]}, i);
}
ll l = -1, r = -1;
for (ll i = 0; i < N; i++)
{
if (X[i] == 1)
{
if (l == -1)
l = i;
r = i;
}
else
{
if (l != -1)
{
s.insert({l, r});
l = r = -1;
}
}
}
if (l != -1)
{
s.insert({l, r});
l = r = -1;
}
return solve();
}
int updateX(int pos, int val)
{
if (x[pos] != 1 && val == 1)
{
auto it = s.upper_bound({pos, pos});
ll l = pos, r = pos;
if (it != s.end() && (*it).l == pos + 1)
{
l = pos, r = (*it).r;
s.erase(it);
}
s.insert({l, r});
it = s.lower_bound({pos, pos});
auto p = s.lower_bound({l, r});
if (it != s.begin())
{
it--;
if ((*it).r == l - 1)
{
l = (*it).l;
s.erase(it);
s.erase(s.lower_bound({pos, pos}));
s.insert({l, r});
}
}
st[r] = l;
ed[l] = r;
seg.s = l + 1,seg.e = r + 1;
vals[l] = seg.queryMax();
}
if (x[pos] == 1 && val != 1)
{
auto it = s.upper_bound({pos, 0});
it--;
ll l = (*it).l, r = pos - 1, l1 = pos + 1, r1 = (*it).r;
s.erase(it);
if (l <= r){
s.insert({l, r});
st[r] = l;
ed[l] = r;
seg.s = l + 1, seg.e = r + 1;
vals[l] = seg.queryMax();
}
if (l1 <= r1){
s.insert({l1, r1});
st[r1] = l1;
ed[l1] = r1;
seg.s = l1 + 1, seg.e = r1 + 1;
vals[l1] = seg.queryMax();
}
}
x[pos] = val;
seg.update({y[pos], x[pos]}, pos);
return solve();
}
int updateY(int pos, int val)
{
y[pos] = val;
seg.update({y[pos], x[pos]}, pos);
return solve();
}
Compilation message
horses.cpp: In member function 'void tree::init(long long int)':
horses.cpp:18:12: warning: conversion from 'double' to 'long long int' may change value [-Wfloat-conversion]
18 | NN = exp2(ceil(log2(n)));
| ~~~~^~~~~~~~~~~~~~~
horses.cpp: In function 'long long int solve()':
horses.cpp:66:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
66 | int i = n - 1;
| ~~^~~
horses.cpp:71:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
71 | i = st[i] - 1;
| ~~~~~~^~~
horses.cpp:80:7: warning: statement has no effect [-Wunused-value]
80 | for (i; i < n; i++)
| ^
horses.cpp:91:12: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
91 | i = ed[i];
| ~~~~^
horses.cpp: In function 'int init(int, int*, int*)':
horses.cpp:147:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
147 | return solve();
| ~~~~~^~
horses.cpp: In function 'int updateX(int, int)':
horses.cpp:163:8: warning: variable 'p' set but not used [-Wunused-but-set-variable]
163 | auto p = s.lower_bound({l, r});
| ^
horses.cpp:203:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
203 | return solve();
| ~~~~~^~
horses.cpp: In function 'int updateY(int, int)':
horses.cpp:210:14: warning: conversion from 'long long int' to 'int' may change value [-Wconversion]
210 | return solve();
| ~~~~~^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Execution timed out |
1547 ms |
4440 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4440 KB |
Output is correct |
| 2 |
Execution timed out |
1571 ms |
4444 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
123 ms |
48228 KB |
Output is correct |
| 2 |
Correct |
162 ms |
48212 KB |
Output is correct |
| 3 |
Correct |
127 ms |
48212 KB |
Output is correct |
| 4 |
Correct |
147 ms |
48352 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Execution timed out |
1593 ms |
4444 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 2 |
Execution timed out |
1596 ms |
4444 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
