Submission #408795

#	Time	Username	Problem	Language	Result	Execution time	Memory
408795		LptN21	Poklon (COCI17_poklon7)	C++14	120 / 120	469 ms	150212 KiB

poklon

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
#define FF first
#define SS second
#define pb push_back
#define sz(x) (int)x.size()
#define oo 1e18
#define eps 1e-9
#define PI acos(-1.0)
#define lb lower_bound
#define ub upper_bound
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> ii;
const int N = 3e6+7, M=20+7;
const int MOD = 1e9+7;

int n, m, k, t;

int val[N], d[N];
vector<int> adj[N];

void dfs(int u, int depth=0) {
    if(!sz(adj[u])) d[depth]=max(d[depth], val[u]);
    else dfs(adj[u][0], depth+1), dfs(adj[u][1], depth+1);
}

signed main() {
    //freopen("test.inp", "r", stdin);
    //freopen("test.out", "w", stdout);
    //fastIO;
    scanf("%d", &n);
    int u, v, r=n;
    memset(d, -1, sizeof d);
    for(int i=1;i<=n;i++) {
        scanf("%d%d", &u, &v);
        if(u<0) {
            val[++r]=-u;
            adj[i].pb(r);
        } else adj[i].pb(u);
        if(v<0) {
            val[++r]=-v;
            adj[i].pb(r);
        } else adj[i].pb(v);
    }
    dfs(1);vector<int> s;
    int ans=-1, ansdepth=-1;
    for(int i=1;i<N;i++) {
        if(d[i]==-1) continue;
        bool ok=0;
        if(ans<0) ok=1;
        else
            for(int j=1, u=2, r=(ans+d[i]-1)/d[i];j<=i-ansdepth;u<<=1, j++)
                if(u>=r) {ok=1;break;}
        if(ok) ans=d[i], ansdepth=i;
    }
    while(ans) s.pb(ans&1), ans>>=1;
    for(int i=sz(s)-1;i>=0;i--) printf("%d", s[i]);
    for(int i=0;i<ansdepth;i++) printf("0");
    return 0;
}
/* stuff you should look for
    - int overflow, array bounds
    - special cases (n=1?)
    - do smth instead of do nothing and stay organized
    - WRITE STUFF DOWN
    - DONT JUST STICK ON ONE APPROACH
*/

Compilation message (stderr)

poklon.cpp: In function 'int main()':
poklon.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
poklon.cpp:37:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 120 / 120