Submission #439047

#	Time	Username	Problem	Language	Result	Execution time	Memory
439047		LptN21	Sjeckanje (COCI21_sjeckanje)	C++14	0 / 110	10 ms	12748 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
//#define oo 2e18
#define eps 1e-9
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
#define all(a) (a).begin(), (a).end()
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
typedef pair<int, ii> i3;
const int N = 2e5+7, M=448;
const int MOD = 1e9+7;
const int oo=1e9+1;

int n, m, k, t;

struct Node{
    ll ans; int l, r;
    Node() {ans=l=r=0;}
    Node(int v) {l=r=v, ans=abs(v);}
    bool sameType(int a, int b) {
        if((a<0&&b>0)||(a>0&&b<0)) return 0;
        return 1;
    }
    Node operator+(const Node &a) {
        Node b; b.l=l, b.r=a.r, b.ans=ans+a.ans;
        if(!sameType(r, a.l)) b.ans-=min(abs(r), abs(a.l));
        return b;
    }
} st[N<<2];

void update(int idx, int l0, int r0, int p, int v) {
    if(l0>p||r0<p) return;
    if(l0==r0&&l0==p) {
        st[idx].l+=v, st[idx].r+=v, st[idx].ans=abs(st[idx].l);
        return;
    }
    int mid=(l0+r0)/2;
    update(idx*2, l0, mid, p, v), update(idx*2+1, mid+1, r0, p, v);
    st[idx]=st[idx*2]+st[idx*2+1];
}
Node get(int idx, int l0, int r0, int l, int r) {
    if(l0>r||r0<l) return Node(0);
    if(l<=l0&&r0<=r) return st[idx];
    int mid=(l0+r0)/2;
    return get(idx*2, l0, mid, l, r)+get(idx*2+1, mid+1, r0, l, r);
}
void upd(int p, int v) {update(1, 1, n, p, v);}
ll qry() {return get(1, 1, n, 1, n).ans;}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d%d", &n, &m);
    int x, y;
    for(int i=1;i<=n;i++) {
        scanf("%d", &y);
        if(i>1) upd(i, y-x);
        x=y;
    }
    for(int i=1;i<=m;i++) {
        scanf("%d%d%d", &x, &y, &k);
        if(x!=1) upd(x, k);
        if(y!=n) upd(y+1, -k);
        printf("%lld\n", qry());
    }
    return 0;
}
/* stuff you should look for
    - int overflow, array bounds
    - special cases (n=1?)
    - do smth instead of do nothing and stay organized
    - WRITE STUFF DOWN
    - DONT JUST STICK ON ONE APPROACH
*/

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:62:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp:65:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         scanf("%d", &y);
      |         ~~~~~^~~~~~~~~~
Main.cpp:70:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         scanf("%d%d%d", &x, &y, &k);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 40
• Subtask 3: 0 / 55