Submission #789486

#TimeUsernameProblemLanguageResultExecution timeMemory
7894868pete8Sjeckanje (COCI21_sjeckanje)C++14
0 / 110
2 ms340 KiB
#include<iostream> #include<stack> #include<map> #include<vector> #include<string> #include<unordered_map> #include <queue> #include<cstring> #include<limits.h> #include<cmath> #include<set> #include<algorithm> #include<bitset> #include<stack> using namespace std; #define ll long long #define f first #define endl "\n" #define s second #define pii pair<int,int> #define pppiiii pair<pii,pii> #define ppii pair<pii,pii> #define all(x) x.begin(),x.end() #define pb push_back #define mp make_pair #define lb lower_bound #define ub upper_bound #define fastio ios::sync_with_stdio(false);cin.tie(NULL); const int mxn=2*1e5+1,mx=1e6; #define int long long struct node{ int dp[2][2],l,r; // left right border }; node seg[2*mxn+10]; int v[mxn+10],d[mxn+10]; int n,q; node merg(node a,node b){ node ans; if(a.l==INT_MAX)return b; else if(b.l==INT_MAX)return a; ans.l=a.l; ans.r=b.r; ans.dp[0][1]=max(a.dp[0][1]+b.dp[0][1],a.dp[0][0]+b.dp[1][1]); ans.dp[0][0]=max(a.dp[0][0]+b.dp[1][0],a.dp[0][1]+b.dp[0][0]); ans.dp[1][0]=max(a.dp[1][0]+b.dp[1][0],a.dp[1][1]+b.dp[0][0]); ans.dp[1][1]=max(a.dp[1][1]+b.dp[0][1],a.dp[1][0]+b.dp[1][1]); if((d[a.r]>0&&d[b.l]>0)||(d[a.r]<0&&d[b.l]<0)){ ans.dp[0][1]=max(ans.dp[0][1],a.dp[0][1]+b.dp[1][1]); ans.dp[0][0]=max(ans.dp[0][0],a.dp[0][1]+b.dp[1][0]); ans.dp[1][0]=max(ans.dp[1][0],a.dp[1][1]+b.dp[1][0]); ans.dp[1][1]=max(ans.dp[1][1],a.dp[1][1]+b.dp[1][1]); } //0 take left/right return ans; } void init(node&a){a.l=a.r=INT_MAX;} void up(int pos,int val){ pos+=n; seg[pos].l=pos-n; seg[pos].r=pos-n; seg[pos].dp[1][1]=val; for(;pos>1;pos>>=1){ node a=seg[pos],b=seg[pos^1]; if(pos&1)swap(a,b); seg[pos>>1]=merg(a,b); } } int qry(int l,int r){ node ansl,ansr; init(ansl); init(ansr); for(l+=n,r+=n;l<=r;l>>=r,r>>=1){ if(l&1)ansl=merg(ansl,seg[l++]); if(!(r&1))ansr=merg(seg[r--],ansr); } ansl=merg(ansl,ansr); return max({ansl.dp[0][0],ansl.dp[0][1],ansl.dp[1][1],ansl.dp[1][0]}); } int32_t main(){ cin>>n>>q; for(int i=0;i<2*n;i++)init(seg[i]); for(int i=0;i<n;i++)cin>>v[i]; n--; for(int i=0;i<n;i++)d[i]=v[i+1]-v[i]; for(int i=0;i<n;i++)up(i,abs(d[i])); while(q--){ int l,r,x;cin>>l>>r>>x; l--,r--; if(l)d[l-1]+=x; if(r<n)d[r]-=x; if(l)up(l-1,abs(d[l-1])); if(r<n)up(r,abs(d[r]));//2 0 2 2 cout<<qry(0,n)<<'\n'; } }
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