Submission #545847

#	Time	Username	Problem	Language	Result	Execution time	Memory
545847		Soul234	Sjeckanje (COCI21_sjeckanje)	C++14	110 / 110	747 ms	28172 KiB

Main

#include<bits/stdc++.h>
using namespace std;

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}

tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a = b, 1 : 0;
}

constexpr int sgn(ll x) { if(x == 0) return 0; return x < 0 ? -1 : 1; }
const ll INF = 1e18;
const int MX = 1<<18;
int N, Q;
ll Delta[MX];
ll st[2*MX][2][2];

void pull(int pos, int mid) {
    int lf = pos<<1, rh = pos<<1|1;
    memset(st[pos], -0x3f, sizeof st[pos]);
    F0R(a,2) F0R(b,2) F0R(c,2) F0R(d,2) {
        if(b && c) {
            if(sgn(Delta[mid]) * sgn(Delta[mid+1]) >= 0) ckmax(st[pos][a][d], st[lf][a][b] + st[rh][c][d]);
        }
        else ckmax(st[pos][a][d], st[lf][a][b] + st[rh][c][d]);
    }
}

void build(int ind = 1, int L = 1, int R = N-1) {
    if(L == R) {
        st[ind][0][0] = 0;
        st[ind][1][0] = st[ind][0][1] = -INF;
        st[ind][1][1] = llabs(Delta[L]);
    }
    else {
        int mid = (L + R) >> 1;
        build(ind<<1, L, mid);
        build(ind<<1|1, mid+1, R);
        pull(ind, mid);
    }
}

void upd(int id, ll val, int ind=1, int L = 1, int R = N-1) {
    if(L == R) {
        st[ind][0][0] = 0;
        st[ind][1][0] = st[ind][0][1] = -INF;
        st[ind][1][1] = llabs(Delta[L]);
    }
    else {
        int mid = (L + R) >> 1;
        if(id > mid) upd(id, val, ind<<1|1, mid+1, R);
        else upd(id, val, ind<<1, L, mid);
        pull(ind, mid);
    }
}

void solve() {
    cin>>N>>Q;
    ll pre;
    F0R(i,N) {
        ll cur; cin>>cur;
        if(i) Delta[i] = cur - pre;
        pre = cur;
    }
    memset(st, -0x3f, sizeof st);
    build();
    while(Q-->0) {
        int l, r;
        ll x;
        cin>>l>>r>>x;
        Delta[l-1] += x;
        Delta[r] -= x;
        if(l) upd(l-1, x);
        if(r<N) upd(r, -x);
        ll ans = -INF;
        F0R(a,2) F0R(b,2) ckmax(ans, st[1][a][b]);
        cout << ans << nl;
    }
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 55 / 55