# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
832320 | TS_2392 | Sailing Race (CEOI12_race) | C++14 | 1083 ms | 5312 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define fileIO(name) if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
#define SPEED {ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);}
template<class T1, class T2> bool minimize(T1 &a, T2 b){return a > b ? a = b, true : false;}
template<class T1, class T2> bool maximize(T1 &a, T2 b){return a < b ? a = b, true : false;}
const int N = 505 ;
int n, type, res, res_vtx, nxt[N], prv[N];
int adj[N][N], dp1[N][N][2], dp2[N][N][2];
int main(){
fileIO("text");
cin >> n >> type;
for(int u = 1, v; u <= n; ++u){
cin >> v;
while(v){
adj[u][v] = 1;
cin >> v;
}
nxt[u] = u + 1; prv[u] = u - 1;
}
nxt[n] = 1; prv[1] = n;
for(int len = 2; len < n; ++len){
for(int i = 1; i <= n; ++i){
int j = i + len - 1;
if(j > n) j -= n;
if(adj[i][j]) dp1[i][j][0] = 1;
for(int k = nxt[i]; k != j; k = nxt[k]) if(adj[k][j] && dp1[i][k][0]){
maximize(dp1[i][j][0], dp1[i][k][0] + 1);
}
if(adj[j][i]) dp1[i][j][1] = 1;
for(int k = prv[j]; k != i; k = prv[k]) if(adj[k][i] && dp1[k][j][1]){
maximize(dp1[i][j][1], dp1[k][j][1] + 1);
}
}
}
for(int len = 2; len < n; ++len){
for(int i = 1; i <= n; ++i){
int j = i + len - 1;
if(j > n) j -= n;
dp2[i][j][0] = dp2[i][prv[j]][0];
if(adj[i][j]) maximize(dp2[i][j][0], dp2[nxt[i]][j][1] + 1);
for(int k = nxt[i]; k != j; k = nxt[k]) if(adj[k][j] && dp1[i][k][0]){
maximize(dp2[i][j][0], dp1[i][k][0] + dp2[k][j][0]);
}
dp2[i][j][1] = dp2[nxt[i]][j][1];
if(adj[j][i]) maximize(dp2[i][j][1], dp2[i][prv[j]][0] + 1);
for(int k = prv[j]; k != i; k = prv[k]) if(adj[k][i] && dp1[k][j][1]){
maximize(dp2[i][j][1], dp1[k][j][1] + dp2[i][k][1]);
}
if(maximize(res, dp2[i][j][0])) res_vtx = i;
if(maximize(res, dp2[i][j][1])) res_vtx = j;
}
}
cout << res << '\n' << res_vtx;
return 0;
}
Compilation message (stderr)
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