Submission #1169323

#	Time	Username	Problem	Language	Result	Execution time	Memory
1169323		SmuggingSpun	Fish 3 (JOI24_fish3)	C++20	16 / 100	62 ms	6732 KiB

Main

#include<bits/stdc++.h>
#define taskname "A"
using namespace std;
typedef long long ll;
template<class T>void minimize(T& a, T b){
    if(a > b){
        a = b;
    }
}
const int lim = 3e5 + 5;
const ll INF = 1e18;
int n, q;
ll d, c[lim];
namespace sub1{
    void solve(){
        for(int _ = 0; _ < q; _++){
            int l, r;
            cin >> l >> r;
            ll mn = INF, ans = 0;
            for(int i = r; i >= l; i--){
                minimize(mn, c[i]);
                if((c[i] - mn) % d != 0 && (mn -= d - (c[i] - mn) % d) < 0){
                    ans = -1;
                    break;
                }
                ans += (c[i] - mn) / d;
            }
            cout << ans << "\n";
        }
    }
}
namespace sub2{
    void solve(){
        vector<int>left(n + 1), f(n + 1);
        left[0] = f[0] = 0;
        for(int i = 1; i <= n; i++){
            left[i] = (c[i] == 0 ? i : left[i - 1]);
            f[i] = f[i - 1] + c[i];
        }
        for(int _ = 0; _ < q; _++){
            int l, r;
            cin >> l >> r;
            if(left[r] <= l){
                cout << "0\n";
                continue;
            }
            if(d == 1){
               cout << f[left[r]] - f[l - 1] << "\n"; 
            }  
            else{
                cout << (f[left[r]] - f[l - 1] == 0 ? 0 : -1) << "\n";
            }
        }
    }
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
    cin >> n >> d;
    for(int i = 1; i <= n; i++){
        cin >> c[i];
    }
    cin >> q;
    if(max(n, q) <= 3000){
        sub1::solve();
    }
    else if(*max_element(c + 1, c + n + 1) <= 1){
        sub2::solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:59:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 7 / 7
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36