Submission #990980

#	Time	Username	Problem	Language	Result	Execution time	Memory
990980		chanhchuong123	Balloons (CEOI11_bal)	C++14	100 / 100	92 ms	7132 KiB

bal

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

const bool multiTest = false;
#define task ""
#define fi first
#define se second
#define MASK(i) (1LL << (i))
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define BIT(mask, i) ((mask) >> (i) & 1)

template<typename T1, typename T2> bool mini(T1 &a, T2 b) {
	if (a > b) a = b; else return 0; return 1;
}
template<typename T1, typename T2> bool maxi(T1 &a, T2 b) {
	if (a < b) a = b; else return 0; return 1;
}

const int MAX = 200020;
int n;
int x[MAX];
int r[MAX];
stack<pair<int, double>> st;

double dis(int x1, double r1, int x2) {
    return 1.0 * (x1 - x2) * (x1 - x2) / (4 * r1);
}

void process(void) {
    cin >> n;
    cout << setprecision(3) << fixed;
    for (int i = 1; i <= n; ++i) {
        cin >> x[i];
        cin >> r[i];
        double ans = r[i];
        while (st.size()) {
            mini(ans, dis(st.top().fi, st.top().se, x[i]));
            if (st.top().se <= ans) st.pop(); else break;
        }
        st.push(make_pair(x[i], ans));
        cout << ans << '\n';
    }
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r",  stdin);
		freopen(task".out", "w", stdout);
	}

	int nTest = 1; if (multiTest) cin >> nTest;
	while (nTest--) {
		process();
	}

	return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:49:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |   freopen(task".inp", "r",  stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:50:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10