Submission #62548

#	Time	Username	Problem	Language	Result	Execution time	Memory
62548		gusfring	Bitaro’s Party (JOI18_bitaro)	C++14	Compilation error	0 ms	0 KiB

bitaro

#include <bits/stdc++.h>
using namespace std;
 
#define pii pair<int, int>
#define fi first
#define se second
 
const int mxN=1e5, bs=80;
int n, m, q, dp2[mxN], c[mxN];
vector<int> adj[mxN];
vector<pii> dp1[mxN];
priority_queue<pii, vector<pii>, greater<pii>> pq;
bool a[mxN];
 
int main() {
	scanf("%d %d %d", &n, &m, &q);
	while(m--) {
		int u, v;
		scanf("%d %d", &u, &v);
      	--u, --v;
		adj[v].push_back(u);
	}
	for(int i=0; i<n; ++i) {
		pq.push({0, i});
		for(int v : adj[i]) {
			for(pii p : dp1[v]) {
				pq.push({p.fi+1, p.se});
				if(pq.size()>bs)
					pq.pop();
			}
		}
		while(!pq.empty()) {
			dp1[i].push_back(pq.top());
			pq.pop();
		}
	}
	while(q--) {
		int t, y, ans=-1;
		scanf("%d %d", &t, &y)
        --t;
		for(int i=0; i<y; ++i) {
			scanf("%d", &c[i]);
          	--c[i];
			a[c[i]]=1;
		}
		if(y>bs) {
			memset(dp2, -1, 4*(t+1));
			for(int i=0; i<=t; ++i) {
				dp2[i]=a[i]?-n:0;
				for(int v : adj[i])
					dp2[i]=max(dp2[v]+1, dp2[i]);
			}
			ans=max(dp2[t], ans);
		} else {
			for(int i=dp1[t].size()-1; i>=0; --i) {
				if(a[dp1[t][i].se])
					continue;
				ans=dp1[t][i].fi;
				break;
			}
		}
		for(int i=0; i<y; ++i)
			a[c[i]]=0;
		printf("%d\n", ans);
	}
  return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'int main()':
bitaro.cpp:40:9: error: lvalue required as decrement operand
         --t;
         ^~
bitaro.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &m, &q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:19:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &u, &v);
   ~~~~~^~~~~~~~~~~~~~~~~
bitaro.cpp:42:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", &c[i]);
    ~~~~~^~~~~~~~~~~~~