#include <bits/stdc++.h>
using namespace std;
#ifndef _LOCAL
//#pragma GCC optimize("O3,Ofast")
#else
#pragma GCC optimize("O0")
#endif
template<typename t> inline void umin(t &a, const t b) {a = min(a, b);}
template<typename t> inline void umax(t &a, const t b) {a = max(a, b);}
typedef pair<int, int> pii;
typedef long long ll;
typedef long double ld;
typedef int8_t byte;
ll time() {return chrono::system_clock().now().time_since_epoch().count();}
mt19937 rnd(time());
#define ft first
#define sd second
#define len(f) int((f).size())
#define bnd(f) (f).begin(), (f).end()
#define _ <<' '<<
const int inf = 1e9 + 5;
const ll inf64 = 4e18 + 5;
const int md = 998244353;
namespace MD {
void add(int &a, const int b) {if((a += b) >= md) a -= md;}
void sub(int &a, const int b) {if((a -= b) < 0) a += md;}
int prod(const int a, const int b) {return ll(a) * b % md;}
};
const int N = 2e5 + 5;
int a[N], q, n;
ll d[N];
ll f[N][2];
struct tree {
tree *l, *r;
ll v[2][2];
void init(int tl) {
v[0][0] = 0;
v[0][1] = -1;
v[1][0] = -1;
v[1][1] = abs(d[tl]);
}
void upd(int md) {
bool pairable = d[md] <= 0 && d[md + 1] <= 0 ||
d[md] >= 0 && d[md + 1] >= 0;
for(int i : {0, 1})
for(int j : {0, 1}) {
v[i][j] = -1;
for(int fl : {0, 1}) {
if(l->v[i][fl] < 0) continue;
for(int fr : {0, 1}) {
if(r->v[fr][j] < 0) continue;
if(fl && fr && !pairable) continue;
umax(v[i][j], l->v[i][fl] + r->v[fr][j]);
}
}
}
}
tree(int tl = 1, int tr = n - 1) {
if(tl < tr) {
int tm = tl + tr >> 1;
l = new tree(tl, tm);
r = new tree(tm + 1, tr);
upd(tm);
} else {
init(tl);
l = r = 0;
}
}
int ans() {
return max(f[n - 1][0], f[n - 1][1]);
ll res = 0;
for(int i : {0, 1})
for(int j : {0, 1})
umax(res, v[i][j]);
return res;
}
void reload(int i, int tl = 1, int tr = n - 1) {
for(int i = 1; i < n; ++i) {
ll fi = i ? d[i - 1] : 0;
ll se = d[i];
for(int j : {0, 1}) {
f[i][j] = -1;
for(int t : {0, 1}) {
if(f[i - 1][j] < 0) continue;
if(t && j && ((fi < 0 && se > 0) ||
(fi > 0 && se < 0))) continue;
umax(f[i][j], f[i - 1][t] + abs(se) * j);
}
}
}
return;
if(tl == tr) return init(tl);
int tm = tl + tr >> 1;
i <= tm
? l->reload(i, tl, tm)
: r->reload(i, tm + 1, tr);
upd(tm);
}
};
void solve() {
cin >> n >> q;
if(n == 1) {
while(q--) cout << "0\n";
return;
}
for(int i = 0; i < n; ++i)
cin >> a[i];
for(int i = 1; i < n; ++i)
d[i] = a[i] - a[i - 1];
tree t {};
while(q--) {
int l, r, x;
cin >> l >> r >> x;
if(--l) {
d[l] += x;
t.reload(l);
}
if(r < n)
d[r] -= x,
t.reload(r);
cout << t.ans() << '\n';
}
}
signed main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#ifndef _LOCAL
// freopen("file.in", "r", stdin);
// freopen("file.out", "w", stdout);
#else
system("color a");
freopen("in.txt", "r", stdin);
int t; cin >> t;
while(t--)
#endif
solve();
}
Compilation message
Main.cpp: In member function 'void tree::upd(int)':
Main.cpp:45:36: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
45 | bool pairable = d[md] <= 0 && d[md + 1] <= 0 ||
| ~~~~~~~~~~~^~~~~~~~~~~~~~~~~
Main.cpp: In constructor 'tree::tree(int, int)':
Main.cpp:62:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
62 | int tm = tl + tr >> 1;
| ~~~^~~~
Main.cpp: In member function 'void tree::reload(int, int, int)':
Main.cpp:96:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
96 | int tm = tl + tr >> 1;
| ~~~^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
364 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
