이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#define f first
#define s second
#define ent '\n'
#define int long long
typedef long long ll;
using namespace std;
const int maxn = 1e5 + 12;
const int mod = 1e9 + 7;
vector<int> g[30];
int cnt[16][16][maxn];
int dp[1 << 16];
int pref[30][maxn];
int suff[30][maxn];
int a[maxn];
int n, m, k;
int get(int x, int pos, int mask) {
int sz = (int)g[x].size();
int ans = pos * (pos - 1) / 2 + (sz - pos) * (sz - pos - 1) / 2;
for(int y = 0; y < m; y++) {
if(x == y || ((mask >> y) & 1) == 0) continue;
ans += cnt[x][y][pos] * 2;
}
return ans;
}
void solve() {
m = 15;
string s;
cin >> s;
n = (int)s.size();
s = '+' + s;
for(int i = 1; i <= n; i++) {
a[i] = s[i] - 'A';
g[a[i]].push_back(i);
}
for(int x = 0; x < 15; x++) {
for(int y = 0; y < 15; y++) {
if(x == y) continue;
for(int i = 0; i <= (int)g[x].size() + 10; i++) {
pref[x][i] = suff[x][i] = 0;
}
for(int i = 0, j = 0; i < g[x].size(); i++) {
int val = g[x][i];
while(j < g[y].size() && g[y][j] <= val) {
j++;
}
pref[x][i + 1] = pref[x][i] + j;
}
for(int i = (int)g[x].size() - 1, j = (int)g[y].size() - 1; i >= 0; i--) {
int val = g[x][i];
while(j >= 0 && g[y][j] >= val) {
j--;
}
suff[x][i + 1] = suff[x][i + 2] + (int)g[y].size() - j - 1;
}
for(int i = 0; i <= (int)g[x].size(); i++) {
cnt[x][y][i] = pref[x][i] + suff[x][i + 1];
}
}
}
for(int mask = 1; mask < (1 << m); mask++) {
dp[mask] = 1e18;
for(int x = 0; x < m; x++) {
if(((mask >> x) & 1) == 0) {
continue;
}
int tm = (mask ^ (1 << x));
dp[mask] = min(dp[mask], get(x, 0, mask) + dp[tm]);
for(int l = 1, r = (int)g[x].size(); l <= r;) {
int mid = l + r >> 1;
int tx = get(x, mid - 1, mask), ty = get(x, mid, mask);
dp[mask] = min({dp[mask], tx + dp[tm], ty + dp[tm]});
if(tx > ty) {
l = mid + 1;
}
else {
r = mid - 1;
}
}
}
}
cout << setprecision(9) << fixed << (double)dp[(1 << m) - 1] / 2.0 << ent;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int t = 1;
// cin >> t;
while(t--){
solve();
}
}
컴파일 시 표준 에러 (stderr) 메시지
passes.cpp: In function 'void solve()':
passes.cpp:46:37: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
46 | for(int i = 0, j = 0; i < g[x].size(); i++) {
| ~~^~~~~~~~~~~~~
passes.cpp:48:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
48 | while(j < g[y].size() && g[y][j] <= val) {
| ~~^~~~~~~~~~~~~
passes.cpp:74:29: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
74 | int mid = l + r >> 1;
| ~~^~~
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