제출 #937365

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
937365		VinhLuu	Palembang Bridges (APIO15_bridge)	C++17	31 / 100	37 ms	8320 KiB

bridge

//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
#define int long long
#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(lmao) lmao.begin(), lmao.end()

using namespace std;

typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
const int N = 2e5 + 5;
const int oo = 1e16;
const int mod = 1e9 + 7;
const int K = 1e5 + 5;

char P[N], Q[N];
int S[N], T[N], k, n, ans, s[N];
vector<int> vr;
vector<pii> h;
int cnt = 0;

namespace sub1{
    void solve(){
        int ret = oo;
        for(int i = 1; i <= cnt << 1; i ++){
            for(int j = i + 1; j <= cnt << 1; j ++){
                int kq = 0;
                for(auto [l, r] : h){
                    if(l <= vr[i - 1] && vr[i - 1] <= r) kq += 1 + vr[i - 1] - l + r - vr[i - 1];
                    else if(l <= vr[j - 1] && vr[j - 1] <= r) kq += 1 + vr[j - 1] - l + r - vr[j - 1];
                    else if(vr[i - 1] <= l && r <= vr[j - 1]) kq += 1 + min(l - vr[i - 1] + r - vr[i - 1], vr[j - 1] - l + vr[j - 1] - r);
                    else if(r <= vr[i - 1]) kq += 1 + vr[i - 1] - l + vr[i - 1] - r;
                    else kq += 1 + l - vr[j - 1] + r - vr[j - 1];
                }
                ret = min(ret, kq + ans);
            }
        }
        ans = ret;
    }
}

namespace sub2{

    int cal(int i,int j){
        int kq = 0;
        for(auto [l, r] : h){
            if(l <= i && i <= r) kq += 1 + i - l + r - i;
            else if(l <= j && j <= r) kq += 1 + j - l + r - j;
            else if(i <= l && r <= j) kq += 1 + min(l - i + r - i, j - l + j - r);
            else if(r <= i) kq += 1 + i - l + i - r;
            else kq += 1 + l - j + r - j;
        }
    }
    void solve(){
        int ret = oo;
        for(int i = 1; i <= cnt << 1; i ++){
            int l = vr[i - 1] + 1, r = min((int)1e9, vr[cnt * 2 - 1]), mid, pos;
            while(l < r){
                mid = (l + r) >> 1;
                int u = cal(vr[i - 1], mid);
                int v = cal(vr[i - 1], mid + 1);
                if(u > v) l = mid + 1; else r = mid;
                ret = min({ret, u, v});
            }
        }
        ans = ret + ans;
    }
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define task "v"
    if(fopen(task ".inp","r")){
        freopen(task ".inp","r",stdin);
        freopen(task ".out","w",stdout);
    }

    cin >> k >> n;


    for(int i = 1; i <= n; i ++){
        cin >> P[i] >> S[i] >> Q[i] >> T[i];
        if(P[i] == Q[i]){
            ans += abs(S[i] - T[i]);
            continue;
        }
        vr.pb(S[i]);
        vr.pb(T[i]);
        cnt++;
        if(S[i] > T[i]) swap(S[i], T[i]);
        h.pb({S[i], T[i]});
    }
    if(!vr.empty()){
        sort(vr.begin(), vr.end());
        int mx = 0;
        for(int i = 1; i <= cnt * 2; i ++) mx = max(mx, vr[i - 1]), s[i] = s[i - 1] + vr[i - 1];
        if(k == 1){
            int kq = oo;
            int lim = vr[cnt - 1];
            for(int j = max(vr[0], lim - (int)1e5); j <= min(vr[2 * cnt - 1], lim + (int)1e5); j ++){
                int i = lower_bound(all(vr), j) - vr.begin();
                if(i < 2 * cnt){
                    i++;}
                    kq = min(kq, cnt + j * (i - 1) - j * (2 * cnt - i + 1) - s[i - 1] + s[cnt * 2] - s[i - 1]);
            }
            ans = ans + kq;
        }else{
            if(n <= 100) sub1 :: solve();
            else sub2 :: solve();
        }
    }
    cout << ans;

}

컴파일 시 표준 에러 (stderr) 메시지

bridge.cpp: In function 'long long int sub2::cal(long long int, long long int)':
bridge.cpp:59:5: warning: no return statement in function returning non-void [-Wreturn-type]
   59 |     }
      |     ^
bridge.cpp: In function 'void sub2::solve()':
bridge.cpp:63:77: warning: unused variable 'pos' [-Wunused-variable]
   63 |             int l = vr[i - 1] + 1, r = min((int)1e9, vr[cnt * 2 - 1]), mid, pos;
      |                                                                             ^~~
bridge.cpp: In function 'int main()':
bridge.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(task ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 9 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37