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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#502840 | #7067. The Great Wall | Decade | WA | 1ms | 5776kb | C++17 | 2.8kb | 2024-08-03 15:11:38 | 2024-08-03 15:11:38 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
// #define int long long
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> PII;
mt19937 rng;
uniform_int_distribution <ull> dist(0,1ull<<63);
//#define mp make_pair
inline void print(__int128 x){//输出模板
if(x<0){
putchar('-');
x=-x;
}
if(x>9) print(x/10);
putchar(x%10+'0');
}
inline int read()
{
int X = 0;
bool flag = 1;
char ch = getchar();
while (ch < '0' || ch > '9')
{
if (ch == '-')
flag = 0;
ch = getchar();
}
while (ch >= '0' && ch <= '9')
{
X = (X << 1) + (X << 3) + ch - '0';
ch = getchar();
}
if (flag)
return X;
return ~(X - 1);
}
const ll mod = 1e9 + 7,INF = 0x3f3f3f3f;
ll qpow(ll a, ll b)
{
ll res = 1;
a %= mod;
assert(b >= 0);
for (; b; b >>= 1)
{
if (b & 1)
res = res * a % mod;
a = a * a % mod;
}
return res;
}
inline int gcd(int a, int b) { return b == 0 ? a : gcd(b, a % b); }
inline int lcm(int a, int b) { return a / gcd(a, b) * b; }
const int N = 10010,M = 1000010;
int a[N],f[N][N];
int stmax[N][22], stmin[N][22], mn[N];
int n,tt;
struct node
{
int id,l;
}stk[N];
void init(){
mn[0] = -1;
for (int i = 1; i <= n; i++){
mn[i] = ((i & (i - 1)) == 0) ? mn[i - 1] + 1 : mn[i - 1];
stmax[i][0] = stmin[i][0] = a[i];
}
for (int j = 1; j <= mn[n]; j++)
for (int i = 1; i + (1 << j) - 1 <= n; i++){
stmax[i][j] = max(stmax[i][j - 1], stmax[i + (1 << (j - 1))][j - 1]);
stmin[i][j] = min(stmin[i][j - 1], stmin[i + (1 << (j - 1))][j - 1]);
}
}
inline int rmq_max(int L, int R){
int k = mn[R - L + 1];
return max(stmax[L][k], stmax[R - (1 << k) + 1][k]);
}
inline int rmq_min(int L, int R){
int k = mn[R - L + 1];
return min(stmin[L][k], stmin[R - (1 << k) + 1][k]);
}
int cal(int k,int r,int now)
{
return f[stk[now].id][k]+rmq_max(stk[now].l+1,r)-rmq_min(stk[now].l+1,r);
}
void solve()
{
cin>>n;
for(int i=1;i<=n;i++) cin>>a[i];
init();
for(int i=0;i<=n;i++) for(int j=0;j<=n;j++) f[i][j] = -1;
f[0][0] = 0;
for(int k=1;k<=n;k++)
{
tt = -1;
for(int i=1;i<=n;i++)
{
if(f[i-1][k-1]!=-1)
{
while(tt!=-1&&cal(k-1,i,tt)<=f[i-1][k-1]) tt--;
stk[++tt] = {i-1,i-1};
}
if(tt!=-1) f[i][k] = max(cal(k-1,i,0),f[i][k]);
}
}
for(int i=1;i<=n;i++)
{
cout<<f[n][i]<<'\n';
}
}
signed main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int t = 1;
//cin>>t;
while (t--)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 1ms
memory: 5704kb
input:
5 1 2 3 4 5
output:
4 3 2 1 0
result:
ok 5 lines
Test #2:
score: 0
Accepted
time: 1ms
memory: 5776kb
input:
5 1 2 1 2 1
output:
1 2 2 1 0
result:
ok 5 lines
Test #3:
score: -100
Wrong Answer
time: 1ms
memory: 5644kb
input:
6 1 1 4 5 1 4
output:
4 4 7 7 4 0
result:
wrong answer 2nd lines differ - expected: '7', found: '4'