Submission #348254

#	Time	Username	Problem	Language	Result	Execution time	Memory
348254		Lukap	Fence (CEOI08_fence)	C++14	100 / 100	2 ms	364 KiB

fence

#include <bits/stdc++.h>

using namespace std;

typedef pair<int,int> point;

const int MAXN = 107;
const int INF = 1e9 + 7;

int n,m;
vector<point> ghull,dhull,hull;
vector<point> rupe,stabla,uzeta_stabla;
vector<pair<point,point>> uzeti_bridovi;
int E[MAXN][MAXN];

map<point,int> koja;

int ccw (point a, point b, point c) {
    return a.first * (b.second - c.second) + b.first * (c.second - a.second) + c.first * (a.second - b.second);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> n >> m;

    for (int i = 0; i < n; i++) {
        int a,b;
        cin >> a >> b;
        rupe.push_back({a,b});
        koja[rupe[i]] = i;
    }

    for (int i = 0; i < m; i++) {
        int a,b;
        cin >> a >> b;
        stabla.push_back({a,b});
    }


    sort(rupe.begin(),rupe.end());

    for (auto p: rupe) {
        while(ghull.size() > 1 && ccw(ghull[ghull.size() - 2], ghull.back(), p) > 0) ghull.pop_back();

        ghull.push_back(p);
    }

    reverse(rupe.begin(), rupe.end());

    for (auto p: rupe) {
        while(dhull.size() > 1 && ccw(dhull[dhull.size() - 2], dhull.back(), p) > 0) dhull.pop_back();

        dhull.push_back(p);
    }

    ghull.pop_back();
    dhull.pop_back();

    for (auto i: ghull) hull.push_back(i);
    for (auto i: dhull) hull.push_back(i);


    for (auto i: stabla) {
        for (int j = 0; j < hull.size(); j++){
            if(j == 0 && ccw(hull[hull.size() - 1],i,hull[0]) < 0) break;

            if(j > 0 && ccw(hull[j - 1],i,hull[j]) < 0) break;

            if(j == hull.size() - 1) uzeta_stabla.push_back(i);
        }
    }

    if(uzeta_stabla.size() == 0) {
        cout << m * 111;
        return 0;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) E[i][j] = INF;
    }

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            if(i == j) continue;

            for (int k = 0; k < uzeta_stabla.size(); k++) {
                if(ccw(rupe[i],uzeta_stabla[k],rupe[j]) < 0) break;
                if(k == uzeta_stabla.size() -1){
                    uzeti_bridovi.push_back({rupe[i],rupe[j]});
                    E[koja[rupe[i]]][koja[rupe[j]]] = 1;
                }
            }
        }
    }


    for (int k = 0; k < n; k++) {
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if(E[i][k] + E[k][j] < E[i][j]) {
                    E[i][j] = E[i][k] + E[k][j];
                }
            }
        }
    }

    int ciklus = INF;

    for (int i = 0; i < n; i++) {
        ciklus = min(ciklus,E[i][i]);
    }

    cout << 20 * ciklus + (stabla.size() - uzeta_stabla.size()) * 111;

    return 0;
}

Compilation message (stderr)

fence.cpp: In function 'int main()':
fence.cpp:66:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |         for (int j = 0; j < hull.size(); j++){
      |                         ~~^~~~~~~~~~~~~
fence.cpp:71:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |             if(j == hull.size() - 1) uzeta_stabla.push_back(i);
      |                ~~^~~~~~~~~~~~~~~~~~
fence.cpp:88:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |             for (int k = 0; k < uzeta_stabla.size(); k++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~~
fence.cpp:90:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   90 |                 if(k == uzeta_stabla.size() -1){
      |                    ~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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