Submission #1086117

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086117		not_amir	Mixture (BOI20_mixture)	C++17	0 / 100	1 ms	604 KiB

Mixture

#include <bits/stdc++.h>
using namespace std;
 
#define pii pair<int, int>
#define PI M_PI - 1e-2
 
int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int S, P, G, N;
    cin >> S >> P >> G >> N;
    G += S + P;
    multiset<pii> pts;
    multiset<double> angles;
    vector<pair<pii, double>> add;
    int ctrp = 0, ctrl = 0, ctrt = 0, t = 0;
    while(N--){
        char c;
        cin >> c;
        if(c == 'A'){
            int x, y, z, divide;
            pii fi;
            double se;
            cin >> x >> y >> z;
            z += x + y;
            x = x * G - S * z;
            y = y * G - P * z;
            if(x == 0 && y == 0)
                ctrp++;
            else{
                divide = gcd(x, y);
                x?x /= divide:0; y?y /= divide:0;
                if(pts.find({-x, -y}) != pts.end()) ctrl++;
                auto it2 = pts.insert(fi = {x, y});
                auto it = angles.insert(se = atan2(y, x));
                if(it == angles.begin())
                    if(*angles.rbegin() - *it > PI) ctrt=1;
                else
                    if(*it - *--it > PI) ctrt=1;
                if(it == angles.end())
                    if(*it - *angles.begin() > PI) ctrt=1;
                else
                    if(*++it - *it > PI) ctrt=1;
                add.push_back({fi, se});
            }
        }
        else{
            int r, x, y;
            cin >> r;
            auto it2 = pts.find(add[r-1].first);
            auto it = angles.find(add[r-1].second);
            x = (*it2).first; y= (*it2).second;
            if(x == 0 && y == 0)
                ctrp--;
            else{
                if(pts.find({-x, -y}) != pts.end()) ctrl--;
                pts.erase(it2);
                if(it == angles.begin())
                    if(*angles.rbegin() - *it > PI) ctrt=0;
                else
                    if(*it - *--it > PI) ctrt=0;
                if(it == angles.end())
                    if(*it - *angles.begin() > PI) ctrt=0;
                else
                    if(*++it - *it > PI) ctrt=0;
                angles.erase(it);
            }
        }
        if(ctrp)
            cout << "1\n";
        else if(ctrl)
            cout << "2\n";
        else if(ctrt)
            cout << "3\n";
        else
            cout << "0\n";
    }
}

Compilation message (stderr)

Mixture.cpp: In function 'int main()':
Mixture.cpp:35:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   35 |                 if(it == angles.begin())
      |                   ^
Mixture.cpp:39:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   39 |                 if(it == angles.end())
      |                   ^
Mixture.cpp:33:22: warning: variable 'it2' set but not used [-Wunused-but-set-variable]
   33 |                 auto it2 = pts.insert(fi = {x, y});
      |                      ^~~
Mixture.cpp:57:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   57 |                 if(it == angles.begin())
      |                   ^
Mixture.cpp:61:19: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   61 |                 if(it == angles.end())
      |                   ^
Mixture.cpp:15:39: warning: unused variable 't' [-Wunused-variable]
   15 |     int ctrp = 0, ctrl = 0, ctrt = 0, t = 0;
      |                                       ^

• Subtask 1: 0 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40