#include "bits/stdc++.h"
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif
using ll = long long;
using pii = pair<int, int>;
#define F first
#define S second
#define sz(x) (int)((x).size())
#define all(x) (x).begin(), (x).end()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll get_rand(ll l, ll r) {
assert(l <= r);
return uniform_int_distribution<ll> (l, r)(rng);
}
#define sgn(x) ((x > 0) - (x < 0))
const ll INF = 1e18;
const int N = 2e5 + 3;
int n, m;
ll a[N];
struct ST{
struct Node{
ll dak[2][2];
};
vector<Node> st;
void init(int _n){
n = _n;
st.resize(4 * n + 6);
}
Node combine(Node &x, Node &y, int mid){
Node res;
res.dak[0][0] = max({x.dak[0][1] + y.dak[0][0], x.dak[0][0] + y.dak[1][0], x.dak[0][0] + y.dak[0][0]});
res.dak[1][0] = max({x.dak[1][1] + y.dak[1][0], x.dak[1][0] + y.dak[1][0], x.dak[1][0] + y.dak[0][0]});
res.dak[0][1] = max({x.dak[0][1] + y.dak[0][1], x.dak[0][0] + y.dak[0][1], x.dak[0][0] + y.dak[1][1]});
res.dak[1][1] = max({x.dak[1][1] + y.dak[0][1], x.dak[1][0] + y.dak[1][1], x.dak[1][0] + y.dak[0][1]});
if(sgn(a[mid]) * sgn(a[mid + 1]) >= 0){
res.dak[0][0] = max(res.dak[0][0], x.dak[0][1] + y.dak[1][0]);
res.dak[0][1] = max(res.dak[0][1], x.dak[0][1] + y.dak[1][1]);
res.dak[1][0] = max(res.dak[1][0], x.dak[1][1] + y.dak[1][0]);
res.dak[1][1] = max(res.dak[1][1], x.dak[1][1] + y.dak[1][1]);
}
return res;
}
void _build(int id, int l, int r){
if(l == r){
st[id].dak[0][1] = st[id].dak[1][0] = -INF;
st[id].dak[1][1] = abs(a[l]);
st[id].dak[0][0] = 0;
return;
}
int mid = (l + r) / 2;
_build(2 * id, l, mid);
_build(2 * id + 1, mid + 1, r);
st[id] = combine(st[2 * id], st[2 * id + 1], mid);
}
void _update(int id, int l, int r, int pos){
if(pos < l or pos > r)
return;
if(l == r){
st[id].dak[0][1] = st[id].dak[1][0] = -INF;
st[id].dak[1][1] = abs(a[l]);
st[id].dak[0][0] = 0;
return;
}
int mid = (l + r) / 2;
if(pos <= mid)
_update(2 * id, l, mid, pos);
else
_update(2 * id + 1, mid + 1, r, pos);
st[id] = combine(st[2 * id], st[2 * id + 1], mid);
}
void build(){
_build(1, 1, n);
}
void update(int pos){
if(pos < 1 or pos > n)
return;
_update(1, 1, n, pos);
}
ll query(){
return max({st[1].dak[0][0], st[1].dak[0][1], st[1].dak[1][0], st[1].dak[1][1]});
}
} dak;
void solve(){
cin >> n >> m;
for(int i = 1; i <= n; ++i)
cin >> a[i];
for(int i = 1; i < n; ++i)
a[i] = a[i] - a[i + 1];
n--;
dak.init(n);
dak.build();
while(m--){
int l, r;
ll x;
cin >> l >> r >> x;
a[l - 1] -= x;
a[r] += x;
dak.update(l - 1);
dak.update(r);
cout << dak.query() << '\n';
}
}
int32_t main() {
cin.tie(nullptr)->sync_with_stdio(0);
#define task "troll"
if(fopen(task".inp", "r")){
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
int test = 1;
// cin >> test;
for(int i = 1; i <= test; ++i){
// cout << "Case #" << i << ": ";
solve();
}
#ifdef LOCAL
cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
#endif
return 0;
}
Compilation message
Main.cpp: In function 'int32_t main()':
Main.cpp:131:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
131 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:132:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
132 | freopen(task".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
