Submission #1185637

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185637		nguyn	Pinball (JOI14_pinball)	C++20	100 / 100	216 ms	46756 KiB

pinball

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = 3e5 + 5;

int n, m, a[N], b[N], c[N], d[N];
pii fl[N], fr[N];
vector<int> cmp;
pii stl[4 * N]; 
pii str[4 * N]; 

void update1(int id, int l, int r, int i, pii x) {
	if (l == r) {
		stl[id] = min(x, stl[id]); 
		return; 
	}		
	int mid = (l + r) / 2; 
	if (i > mid) {
		update1(id * 2 + 1, mid + 1, r, i, x); 
	}
	else {
		update1(id * 2, l, mid, i, x); 
	}
	stl[id] = min(stl[id * 2], stl[id * 2 + 1]);
}

void update2(int id, int l, int r, int i, pii x) {
	if (l == r) {
		str[id] = max(x, str[id]); 
		return; 
	}		
	int mid = (l + r) / 2; 
	if (i > mid) {
		update2(id * 2 + 1, mid + 1, r, i, x); 
	}
	else {
		update2(id * 2, l, mid, i, x); 
	}
	str[id] = max(str[id * 2], str[id * 2 + 1]);
}

pii get1(int id, int l, int r, int u, int v) {
	if (u <= l && r <= v) return stl[id]; 
	int mid = (l + r) / 2; 
	if (mid < u) return get1(id * 2 + 1, mid + 1, r, u, v); 
	if (v <= mid) return get1(id * 2, l, mid, u, v); 
	return min(get1(id * 2, l, mid, u, v), get1(id * 2 + 1, mid + 1, r, u, v));
}

pii get2(int id, int l, int r, int u, int v) {
	if (u <= l && r <= v) return str[id]; 
	int mid = (l + r) / 2; 
	if (mid < u) return get2(id * 2 + 1, mid + 1, r, u, v); 
	if (v <= mid) return get2(id * 2, l, mid, u, v); 
	return max(get2(id * 2, l, mid, u, v), get2(id * 2 + 1, mid + 1, r, u, v));
}


signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> m >> n; 
    for (int i = 1; i <= m; i++) {
    	cin >> a[i] >> b[i] >> c[i] >> d[i];
    	cmp.pb(a[i]);
    	cmp.pb(b[i]);
    	cmp.pb(c[i]);
    }
    cmp.pb(1);
    cmp.pb(n); 
    sort(cmp.begin(), cmp.end());
    cmp.erase(unique(cmp.begin(), cmp.end()), cmp.end()); 
    n = cmp.size();
    for (int i = 1; i <= m; i++) {
    	a[i] = upper_bound(cmp.begin(), cmp.end(), a[i]) - cmp.begin();
    	b[i] = upper_bound(cmp.begin(), cmp.end(), b[i]) - cmp.begin();
    	c[i] = upper_bound(cmp.begin(), cmp.end(), c[i]) - cmp.begin();
    }
    for (int i = 1; i <= 4 * n + 5; i++) {
    	stl[i] = {1e18, 1e18};
    	str[i] = {-1e18, -1e18};
    }
   	int res = 1e18;
    for (int i = 1; i <= m; i++) {
    	fl[i] = {a[i], d[i]};
    	fr[i] = {b[i], -d[i]};
    	// for (int j = 1; j < i; j++) {
    	// 	if (a[i] <= c[j] && c[j] <= b[i]) {
    	// 		pii x = fl[j];
    	// 		x.S += d[i]; 
    	// 		fl[i] = min(fl[i], x); 
    	// 		x = fr[j]; 
    	// 		x.S -= d[i];
    	// 		fr[i] = max(fr[i], x);
    	// 	}	
    	// }
    	pii x = get1(1, 1, n, a[i], b[i]); 
    	x.S += d[i]; 
    	fl[i] = min(fl[i], x); 
    	x = get2(1, 1, n, a[i], b[i]); 
    	x.S -= d[i]; 
    	fr[i] = max(fr[i], x); 
    	update1(1, 1, n, c[i], fl[i]);
    	update2(1, 1, n, c[i], fr[i]);
    	if (fl[i].F == 1 && fr[i].F == n) {
    		res = min(res, fl[i].S - fr[i].S - d[i]);  
    	}
    }
    if (res == 1e18) cout << -1;
    else cout << res;
}

Compilation message (stderr)

pinball.cpp: In function 'int main()':
pinball.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 18 / 18
• Subtask 3: 22 / 22
• Subtask 4: 49 / 49