Submission #1037616

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037616		KasymK	Palembang Bridges (APIO15_bridge)	C++17	17 / 100	2096 ms	2140 KiB

bridge

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int MOD = 1e9+7;
const int INF = 1e9;
const int N = 1e5+5;
int s[N], t[N];
char p[N], q[N];

int main(){
	int k, n;
	scanf("%d%d", &k ,&n);
	for(int i = 1; i <= n; ++i){
		char a, b;
		int x, y;
		scanf(" %c %d %c %d", &a, &x, &b, &y);
		p[i] = a, s[i] = x, q[i] = b, t[i] = y;
	}
	if(k == 1){
		ll answer = 1e18;
		for(int k = 1; k <= n; ++k){
			ll sm = 0;
			int br = s[k];
			for(int i = 1; i <= n; ++i){
				if(p[i] == q[i]){
					sm += abs(s[i]-t[i]);
					continue;
				}
				// p[i] != q[i]
				sm++; // this is for bridge crossing
				sm += abs(br-s[i]);
				sm += abs(br-t[i]);
			}
			umin(answer, sm);
			sm = 0;
			br = t[k];
			for(int i = 1; i <= n; ++i){
				if(p[i] == q[i]){
					sm += abs(s[i]-t[i]);
					continue;
				}
				sm++;
				sm += abs(br-s[i]);
				sm += abs(br-t[i]);
			}
			umin(answer, sm);
		}
		printf("%lld\n", answer);
		return 0;
	}
	// k = 2
	ll answer = 1e18;
	for(int x = 1; x <= n; ++x)
		for(int y = 1; y <= n; ++y){
			if(s[x] == t[y])
				continue; // two bridge cannot be in same place
			ll sm = 0;
			int br = s[x], br_ = t[y];
			for(int i = 1; i <= n; ++i){
				if(p[i] == q[i]){
					sm += abs(s[i]-t[i]);
					continue;
				}
				sm++;
				ll A = abs(br-s[i])+abs(br-t[i]);
				ll B = abs(br_-s[i])+abs(br_-t[i]);
				sm += min(A, B);
			}
			umin(answer, sm);
			sm = 0;
			if(s[y] == t[x])
				continue;
			br = s[y], br_ = t[x];
			for(int i = 1; i <= n; ++i){
				if(p[i] == q[i]){
					sm += abs(s[i]-t[i]);
					continue;
				}
				sm++;
				ll A = abs(br-s[i])+abs(br-t[i]);
				ll B = abs(br_-s[i])+abs(br_-t[i]);
				sm += min(A, B);
			}
			umin(answer, sm);
		}
	printf("%lld\n", answer);
	return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:21:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |  scanf("%d%d", &k ,&n);
      |  ~~~~~^~~~~~~~~~~~~~~~
bridge.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |   scanf(" %c %d %c %d", &a, &x, &b, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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