이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define PUT(a, b) freopen(a, "r", stdin); freopen(b, "w", stdout);
#define all(a) a.begin(), a.end()
#define answerNO {cout << "NO" << endl;}
#define answerYES {cout << "YES" << endl;}
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define replr(i, a, b) for (int i = int(a); i <= int(b); ++i)
#define reprl(i, a, b) for (int i = int(a); i >= int(b); --i)
#define rep(i, n) for (int i = 0; i < int(n); ++i)
#define mkp(a, b) make_pair(a, b)
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef vector<int> VI;
typedef vector<PII> VPI;
typedef pair<ll, ll> PLL;
typedef vector<ll> VL;
typedef vector<PLL> VPL;
template<class T> T setmax(T& a, T b) {if (a < b) return a = b; return a;}
template<class T> T setmin(T& a, T b) {if (a < b) return a; return a = b;}
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
ll mod = 1e9 + 7;
void solve(){
ll n; cin >> n;
VPL v(n);
VPL a(n);
rep(i, n){
ll l, r; cin >> l >> r;
a[i].ff = max(0ll, i - l);
a[i].ss = min(n - 1, i + r);
v[i].ff = a[i].ss - a[i].ff;
v[i].ss = i;
}
ll ans = 0;
vector<bool> vis(n, 0);
vector<bool> b(n);
sort(all(v));
rep(i, n){
bool ok = 1;
replr(j, a[v[i].ss].ff, a[v[i].ss].ss){
if(b[j] == 1){
ok = 0;
}
}
if(ok){
//cout << v[i].ss;
if(!vis[v[i].ss]){
b[v[i].ss] = 1;
replr(j, a[v[i].ss].ff, a[v[i].ss].ss){
vis[j] = 1;
}
ans++;
}
}
}
//cout << endl;
cout << ans << "\n";
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL), cout.tie(NULL);
//PUT("traffic.in", "traffic.out");
int t = 1;
//cin >> t;
while(t--){
solve();
}
}
/*7
0 0 0
0 0 1
1 0 2
1 0 3
2 0 4
3 0 5
2 0 6
*/
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |
# | Verdict | Execution time | Memory | Grader output |
---|
Fetching results... |