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zoj 1277 Transferable Voting

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zoj 1277 Transferable Voting

#include<cstdio>#include<vector>#include<deque>#include<algorithm>#include<cstring>#include<set>using namespace std;namespace{bool cmp(const pair<int, int> &p1, const pair<int, int> &p2){return p1.second != p2.second ?p1.second > p2.second : p1.first < p2.first;}}int main(){int c, n;vector<deque<int> > V;set<int> S;int count[6], cs = 0;vector<pair<int, int> > P;while (scanf("%d %d", &c, &n), c || n){printf("Election #%dn", ++cs);V.clear();int bad = 0;for (int i = 0; i < n; i++){deque<int> q;int num;bool valid = true;for (int j = 0; j < c; j++){scanf("%d", &num);if (num < 1 || num > c|| find(q.begin(), q.end(), num) != q.end())valid = false;q.push_back(num);}if (valid)V.push_back(q);elsebad++;}printf("   %d bad ballot(s)n", bad);S.clear();int total = n - bad;while (true){memset(count, 0, sizeof(count));P.clear();for (size_t i = 0; i < V.size(); i++)count[V[i].front()]++;for (int i = 1; i <= c; i++)if (count[i])P.push_back(make_pair(i, count[i]));sort(P.begin(), P.end(), cmp);if (P.front().second > total / 2){printf("   Candidate %d is elected.n", P.front().first);break;}int min = P.back().first;S.insert(min);for (size_t i = 0; i < V.size(); i++)while (!V[i].empty() && S.find(V[i].front()) != S.end())V[i].pop_front();for (size_t i = 0; i < V.size(); i++)count[V[i].front()]++;for (int i = 1; i <= c; i++)if (count[i])P.push_back(make_pair(i, count[i]));sort(P.begin(), P.end(), cmp);vector<int> T;int max = P.front().second;for (size_t i = 0; i < P.size(); i++)if (P[i].second == max)T.push_back(P[i].first);if (T.size() > 1){printf("   The following candidates are tied:");for (size_t i = 0; i < T.size(); i++)printf(" %d", T[i]);puts("");break;}}}return 0;}
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