Submission #42826

#	Time	Username	Problem	Language	Result	Execution time	Memory
42826		nonocut	Wiring (IOI17_wiring)	C++14	0 / 100	1063 ms	6168 KiB

wiring

//S4
#include "wiring.h"
#include<bits/stdc++.h>
using namespace std;
#define vi vector<int>
#define ll long long
const int maxn = 2e5 + 5;
const ll inf = 1e16;
int n,m;
int pos[maxn];
ll sum[maxn];
ll dp[maxn];
ll get(int l1, int r1, int l2, int r2) {
    ll res = (sum[r2]-sum[l2-1]) - (sum[r1]-sum[l1-1]);
    res += (ll)max(0,(r2-l2+1)-(r1-l1+1))*(-(sum[r1]-sum[r1-1]));
    res += (ll)max(0,(r1-l1+1)-(r2-l2+1))*(sum[l2]-sum[l2-1]);
//    printf("----- get (%d, %d) (%d, %d) = %lld\n",l1,r1,l2,r2,res);
    return res;
}
ll min_total_length(vi a, vi b) {
    n = a.size(); m = b.size();
    for(auto x : a) pos[x] = 0;
    for(auto x : b) pos[x] = 1;
    for(int i=1;i<=n+m;i++) sum[i] = sum[i-1] + i;
    for(int x=n+m;x>=1;x--) {
        dp[x] = inf;
        int cnt = 0, i = -1;
        for(int y=x+1;y<=n+m;y++) {
//            printf("\tx = %d y = %d\n",x,y);
            if(pos[y]!=pos[y-1]) {
                if(i==-1) i = y;
                else break;
            }
            if(i!=-1) dp[x] = min(dp[x], get(x,i-1,i,y) + dp[y+1]);
        }
//        printf("dp %d = %lld\n",x,dp[x]);
    }
    return dp[1];
}

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:27:13: warning: unused variable 'cnt' [-Wunused-variable]
         int cnt = 0, i = -1;
             ^

• Subtask 1: 0 / 7
• Subtask 2: 0 / 13
• Subtask 3: 0 / 10
• Subtask 4: 0 / 25
• Subtask 5: 0 / 45