Submission #706392

#	Time	Username	Problem	Language	Result	Execution time	Memory
706392		vjudge1	Balloons (CEOI11_bal)	C++11	30 / 100	161 ms	2048 KiB

bal

#include<iostream>
#include<vector>
using namespace std;
vector<pair<long double,long double> > curr;
int n;
long double findval(int pos, long double x) {
    return (curr[pos].first-x)*(curr[pos].first-x)/4.0/curr[pos].second;
}
int main () {
    scanf("%d",&n);
    for(int i = 0; i < n; i++) {
        long double x,rad;
        int minp = curr.size();
        scanf("%Lf%Lf",&x,&rad);
        if(curr.size() > 0) {
            while(curr.size() > 1 && findval(curr.size()-1,x) > findval(curr.size()-2,x)) curr.pop_back();
            rad = min(rad,findval(curr.size()-1,x));
        }
        while(curr.size() > 0 && rad+((long double) 1e-18) > curr.back().second) curr.pop_back();
        curr.push_back(make_pair(x,rad));
        printf("%.3Lf\n",rad);
    }
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:13:13: warning: unused variable 'minp' [-Wunused-variable]
   13 |         int minp = curr.size();
      |             ^~~~
bal.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
bal.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         scanf("%Lf%Lf",&x,&rad);
      |         ~~~~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10