Submission #320960

#	Time	Username	Problem	Language	Result	Execution time	Memory
320960		MarcoMeijer	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	744 ms	157156 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const vector<T>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class T> void OUT(const vector<T>& x) {RE(i,x.size()) OUT(i==0?"":" ",x[i]);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
//===================//
//  Added libraries  //
//===================//
 
//===================//
//end added libraries//
//===================//
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//

int n;
stack<ii> stck;

void inputNumber(int &number) { 
    bool negative = false;
    char c;
    number = 0;
    c = getchar(); 
    if(c=='-')
        negative = true, c = getchar();
    for(; (c>='0' && c<='9'); c=getchar()) 
        number = number*10 + c - '0'; 
    if(negative) number = -number; 
}

void program() {
    inputNumber(n);
    RE(i,n) {
        int x, y;
        inputNumber(x); inputNumber(y);
        while(1) {
            if(stck.empty())
                break;
            ii p = stck.top();
            int dia1 = p.fi-p.se;
            if(x-y <= dia1) {
                stck.pop();
            } else {
                break;
            }
        }
        if(stck.empty()) {
            stck.push({x,y});
            continue;
        }
        ii p = stck.top();
        int dia2 = p.fi+p.se;
        if(x+y <= dia2)
            continue;
        stck.push({x,y});
    }
    OUTL(stck.size());
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 20 / 20