Submission #1019912

#	Time	Username	Problem	Language	Result	Execution time	Memory
1019912		YassineBenYounes	Fish 3 (JOI24_fish3)	C++17	7 / 100	82 ms	10348 KiB

Main

#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<int, null_type, less<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 = 3e5+5;
const int LOG = 25;
const int inf = 1e9;
const ll mod = 998244353;

ll arr[mx];
int nxt[mx], pf[mx];
int main(){
    speed;
    ll d;
    int n;cin >> n >> d;
    for(int i = 0; i < n;i++){
        cin >> arr[i];
    }
    for(int i = 0; i < n;i++){
        pf[i] = (i == 0 ? 0 : pf[i-1]) + arr[i];
        if(arr[i] == 1){
            if(i > 0){
                if(arr[i-1] == 0){
                    nxt[i] = i;
                }
                else{
                    nxt[i] = nxt[i-1];
                }
            }
            else{
                nxt[i] = i;
            }
        }
        else{
            nxt[i] = -1;
        }
    }
    int q;cin >> q;
    while(q--){
        int l, r;cin >> l >> r;l--;r--;
        int k = nxt[r];
        if(k == -1){
            int needed = pf[r] - (l == 0 ? 0 : pf[l-1]);
            if(needed == 0){
                cout << 0 << endl;
                continue;
            }
            if(d == 1){
                cout << needed << endl;
            }
            else{
                cout << -1 << endl;
            }
        }
        else{
            k = max(k, l);
            int needed = pf[r] - (l == 0 ? 0 : pf[l-1]) - (r-k+1);
            if(needed == 0){
                cout << 0 << endl;
                continue;
            }
            if(d == 1){
                cout << needed << endl;
            }
            else{
                cout << -1 << endl;
            }
        }
    }
}
 
/*
    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)

Main.cpp: In function 'void usaco_problem()':
Main.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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.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);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp: In function 'void init()':
Main.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);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.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 / 9
• Subtask 2: 7 / 7
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36