Submission #755970

#	Time	Username	Problem	Language	Result	Execution time	Memory
755970		vjudge1	Pinball (JOI14_pinball)	C++17	0 / 100	2 ms	596 KiB

pinball

#include<bits/stdc++.h>
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<pair<int, int>, null_type, less<pair<int, int>>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd  pair<double,double>
#define vdd  vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////

void usaco_problem(){
    freopen("milkvisits.in", "r", stdin);
    freopen("milkvisits.out", "w", stdout);
}

void init(){
    #ifndef ONLINE_JUDGE
 
freopen("input.txt", "r", stdin);
 
freopen("output.txt", "w", stdout);
 
#endif // ONLINE_JUDGE
}

const int mx = 1005;
const int LOG = 25;
const ll inf = 1e9;
const ll mod = 1e9+7;

int a[mx], b[mx], c[mx], d[mx];

set<int> nxt[mx];
int n, m;

bool verify(vector<vi> v){
    sort(all(v));
    if(v[0][0] != 1)return 0;
    int r = v[0][1];
    for(int i = 1; i < n;i++){
        if(v[i][0] > r+1){
            return 0;
        }
        r = max(r, v[i][1]);
    }
    if(r != m)return 0;
    int c = 0;
    for(int i = 0; i < n;i++){
        if(nxt[i].empty())c++;
    }
    if(c >= 2){
        return 0;
    }
    return 1;
}

void run_case(){
    cin >> n >> m;
    vector<vi> v;
    ll cost = 0;
    for(int i = 0; i < n;i++){
        cin >> a[i] >> b[i] >> c[i] >> d[i];
        v.pb({a[i], b[i], i});
        cost += d[i];
    }
    for(int i = 0; i < n;i++){
        for(int j = i+1;j < n;j++){
            if(c[i] >= a[j] && c[i] <= b[j]){
                nxt[i].insert(j);
            }
        }
    }
    if(!verify(v)){
        cout << -1 << endl;
        return;
    }
    for(int i = n-1;i >= 0;i--){
        bool ok = 1;
        int l = inf, r = -inf;
        for(int k = 0; k < n;k++){
            if(v[k][2] == i)continue;
            if(r != -inf && v[k][0] > r+1){
                ok = 0;
            }
            l = min(l, v[k][0]);
            r = max(r, v[k][1]);
        }
        if(r != m || l != 1)ok = 0;
        if(!ok)continue;
        for(int j = i-1;j >= 0;j--){
            if(nxt[j].size() == 1 && nxt[j].count(i)){
                ok = 0;
            }
        }
        if(ok){
            for(int j = i-1;j >= 0;j--){
                nxt[j].erase(i);
            }
            cost -= d[i];
        }
    }
    cout << cost << endl;
}

int main(){
    init();
    speed;
    int t;
    //cin >> t;
    t = 1;
    while(t--){
        run_case();
    }
}

/*
    NEVER GIVE UP!
    DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
    Your Guide when stuck:
    - Continue keyword only after reading the whole input
    - Don't use memset with testcases
    - Check for corner cases(n=1, n=0)
    - Check where you declare n(Be careful of declaring it globally and in main)
*/

Compilation message (stderr)

pinball.cpp: In function 'void usaco_problem()':
pinball.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     freopen("milkvisits.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |     freopen("milkvisits.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp: In function 'void init()':
pinball.cpp:40:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 | freopen("input.txt", "r", stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
pinball.cpp:42:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 | freopen("output.txt", "w", stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 18
• Subtask 3: 0 / 22
• Subtask 4: 0 / 49