Submission #978248

#	Time	Username	Problem	Language	Result	Execution time	Memory
978248		nnin	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	2093 ms	468 KiB

bridge

#include<bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
using ll = long long;
#define f first
#define s second

vector<pii> cross;
int N, K, MN, MX;

ll check1(int bridge) {
    ll ret = 0;
    for(auto [st, en]:cross) {
        if(bridge<st) ret += (ll)st-bridge+en-bridge;
        else if(bridge>en) ret += (ll)bridge-st+bridge-en;
        else ret += (ll)en-st;
    }
    return ret;
}

ll check2(int br1, int br2) {
    ll ret = 0;
    for(auto [st, en]:cross) {
        if((st<=br1&&br1<=en) || (st<=br2&&br2<=en)) ret += (ll)en-st;
        else if(br2<st) ret += (ll)st-br2+en-br2;
        else if(br1>en) ret += (ll)br1-st+br1-en;
        else ret += min((ll)st-br1+en-br1, (ll)br2-st+br2-en);
    }
    return ret;
}

ll one() {
    if(cross.empty()) return 0;
    ll ret = 2e9;
    for(int i=MN;i<=MX;i++) ret = min(ret, check1(i));
    return ret;
}

ll two() {
    if(cross.empty()) return 0;
    ll ret = 2e9;
    for(int i=MN;i<=MX;i++) for(int j=i+1;j<=MX;j++) ret = min(ret, check2(i, j));
    return ret;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin>>K>>N;
    ll ans = 0;
    MN = 2e9, MX = -2e9;
    for(int i=0;i<N;i++) {
        char z1, z2;
        int b1, b2;
        cin>>z1>>b1>>z2>>b2;
        if(z1==z2) {
            ans += abs(b1-b2);
        } else {
            cross.push_back({min(b1, b2), max(b1, b2)});
            MN = min(MN, min(b1, b2));
            MX = max(MX, max(b1, b2));
        }
    }
    ans += cross.size();
    if(K==1) cout<<ans+one();
    else cout<<ans+two();
}

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