Submission #334155

#	Time	Username	Problem	Language	Result	Execution time	Memory
334155		Kerim	Bigger segments (IZhO19_segments)	C++17	37 / 100	1581 ms	11756 KiB

segments

#include "bits/stdc++.h"
#define MAXN 500009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
int dp[MAXN],arr[MAXN],n,ok,tmp;
ll par[MAXN];
set<int>one,zero;
int get(int i){
	return lower_bound(par+i+1,par+n+1,2*par[i]-par[dp[i]])-par;
}	
int main(){
   // freopen("file.in", "r", stdin);
    scanf("%d",&n);
    for(int i=1;i<=n;i++){
    	scanf("%d",arr+i);
    	par[i]=par[i-1]+arr[i];
    }
    for(int i=1;i<=n;i++)
    	one.insert(i);
    stack<int>add,rem,far;
    for(int j=2;j<=n;j++){
    	ok=0;
    	__typeof((one).begin())a=one.end();
    	while(a!=one.begin()){a--;
			if(*a<j-1)
				break;
			tmp=get(*a);
    		__typeof((zero).begin())b=zero.end();
    		while(b!=zero.begin()){b--;
    			if(*b<tmp)
    				break;
    			dp[*b]=*a;ok=1;
    			add.push(*b);
    			far.push(*b);
    		}
			zero.insert(*a);
    		while(!far.empty())
    			zero.erase(far.top()),far.pop();
    		rem.push(*a);
    	}
    	while(!rem.empty())
    		one.erase(rem.top()),rem.pop();
    	while(!add.empty())
    		one.insert(add.top()),add.pop();
		if(!ok){
			printf("%d\n",j-1);	
			return 0;
		}
    }printf("%d\n",n);
	return 0;
}

Compilation message (stderr)

segments.cpp: In function 'int main()':
segments.cpp:58:6: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
   58 |      while(!add.empty())
      |      ^~~~~
segments.cpp:60:3: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'while'
   60 |   if(!ok){
      |   ^~
segments.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
segments.cpp:30:11: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |      scanf("%d",arr+i);
      |      ~~~~~^~~~~~~~~~~~

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 10 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27