Submission #44892

#	Time	Username	Problem	Language	Result	Execution time	Memory
44892		PowerOfNinjaGo	Candies (JOI18_candies)	C++17	0 / 100	3 ms	504 KiB

candies

//Power Of Ninja Go
#include <bits/stdc++.h>
//#ifdef atom #else #endif
using namespace std;
typedef long long ll; typedef pair<int, int> ii; typedef vector<int> vi; typedef vector< ii > vii;
#define X first
#define Y second
#define pb push_back
const int maxn = 2e5+5;
int pred[maxn], succ[maxn];
ll cost[maxn]; bool dong[maxn];
int n;
bool val(int x)
{
    return x>=1 && x<= n;
}
int main()
{
    scanf("%d", &n);
    for(int i = 1; i<= n; i++)
    {
        pred[i] = i-1; succ[i] = i+1;
    }
    for(int i = 1; i<= n; i++) scanf("%d", &cost[i]);
    priority_queue< pair<ll, int> > pq;
    for(int i = 1; i<= n; i++) pq.push(make_pair(cost[i], i));
    ll ans = 0;
    int rounds = (n+1)/2;
    while(!pq.empty() && rounds)
    {
        auto k = pq.top(); pq.pop();
        ll w = k.X; int u = k.Y;
        if(dong[u]) continue;
        ans += w;
        rounds--;
        cost[u] = (val(pred[u])?cost[pred[u]]:0)+(val(succ[u])?cost[succ[u]]:0)-cost[u];
        dong[pred[u]] = dong[succ[u]] = true;
        if(val(pred[pred[u]])) succ[pred[pred[u]]] = u;
        pred[u] = pred[pred[u]];
        if(val(succ[succ[u]])) pred[succ[succ[u]]] = u; succ[u] = succ[succ[u]];
        pq.push(ii(cost[u], u));
        printf("%lld\n", ans);
    }
}

Compilation message (stderr)

candies.cpp: In function 'int main()':
candies.cpp:24:52: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'll* {aka long long int*}' [-Wformat=]
     for(int i = 1; i<= n; i++) scanf("%d", &cost[i]);
                                            ~~~~~~~~^
candies.cpp:40:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if(val(succ[succ[u]])) pred[succ[succ[u]]] = u; succ[u] = succ[succ[u]];
         ^~
candies.cpp:40:57: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
         if(val(succ[succ[u]])) pred[succ[succ[u]]] = u; succ[u] = succ[succ[u]];
                                                         ^~~~
candies.cpp:19:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
candies.cpp:24:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1; i<= n; i++) scanf("%d", &cost[i]);
                                ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 92