제출 #476767

#제출 시각아이디문제언어결과실행 시간메모리
476767ponytailArranging Shoes (IOI19_shoes)C++17
컴파일 에러
0 ms0 KiB
#include <bits/stdc++.h> using namespace std; const int MAXN = 1e5 + 5; typedef long long ll; int n; int inv(int x){ if(x<0) return -x; else if(x>n) return x - n; else return x + n; } mt19937 rng((int)std::chrono::steady_clock::now().time_since_epoch().count()); ll same_size(vector<int> S) { ll ans1 = 0, ans2 = 0; n = S.size() / 2; map<int, queue<int> > mp; int nxt = 0; for(int i=0; i<2*n; i++) { if(mp[inv(S[i])].size()){ ans1 += abs(mp[inv(S[i])].front() - nxt) + abs(i - nxt - 1); ans2 += (S[i]<0); nxt += 2; mp[inv(S[i])].pop(); } else{ mp[inv(inv(S[i]))].push(i); } } return ans1 / 2 + ans2; } ll count_swaps(vector<int> S) { ll wow = S.size() / 2; return wow *(wow-1) / 2; int nxt = 0; ll ans = 0; map<int, vector<int> > mp; for(int i=0; i<S.size(); i++) { mp[abs(S[i])].push_back(S[i]); } for(auto x: mp) { ans += same_size(x.second); } map<int, int> freq; for(int i=0; i<S.size(); i++) { if(freq[abs(S[i])] & 1) S[i] = abs(S[i]); else S[i] = -abs(S[i]); freq[abs(S[i])]++; } for(int i=0; i<S.size(); i++) { if(S[i] < 0) { for(int j=i-1; j>=nxt; j--) { swap(S[j], S[j+1]); ans++; } for(int j=nxt+1; j<S.size(); j++) { if(S[j] == -S[nxt]) { for(int k=j-1; k>=nxt+1; k--) { swap(S[k], S[k+1]); ans++; } break; } } nxt += 2; } } return ans; } void solve() { int n = uniform_int_distribution<int>(1, 4)(rng); //cin >> n; vector<int> v(2*n); for(int i=0; i<n; i++) v[i] = uniform_int_distribution<int>(1, n)(rng); for(int i=n; i<2*n; i++) { v[i] = -v[i-n]; } shuffle(v.begin(), v.end(), rng); cout <<"Input:\n"; cout << n <<" \n"; for(int x:v) cout << x<<" "; cout<<"\nOutput:\n"; cout << count_swaps(v) << "\n"; } int main() { for(int i=0; i<100; i++) { solve(); } }

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |     for(int i=0; i<S.size(); i++) {
      |                  ~^~~~~~~~~
shoes.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i=0; i<S.size(); i++) {
      |                  ~^~~~~~~~~
shoes.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |     for(int i=0; i<S.size(); i++) {
      |                  ~^~~~~~~~~
shoes.cpp:54:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |             for(int j=nxt+1; j<S.size(); j++) {
      |                              ~^~~~~~~~~
/usr/bin/ld: /tmp/ccbIAENN.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccmc17jN.o:shoes.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status