Submission #106487

#	Time	Username	Problem	Language	Result	Execution time	Memory
106487		wilwxk	Regions (IOI09_regions)	C++11	10 / 100	576 ms	131072 KiB

regions

#include <bits/stdc++.h>
using namespace std;

const int MAXN=2e5+5;
const int MAXC=25005;
const int T=200;
vector<int> g[MAXN];
int cor[MAXN], tam[MAXN], ind[MAXN], indg[MAXN];
int dp[MAXN][1005];
int precalc[1005][MAXN];
vector<int> v, lista[MAXN], grandes;
int n, r, q;

void dfs(int cur, int p) {
	tam[cur]=1; 
	ind[cur]=v.size();
	v.push_back(cor[cur]);

	for(int i=1; i<grandes.size(); i++) dp[cur][i]=dp[p][i];
	if(cur!=p) dp[cur][indg[cor[p]]]++;

	for(auto viz : g[cur]) {
		if(viz==p) continue;
		dfs(viz, cur);
		tam[cur]+=tam[viz];
	}
}

int main() {
	scanf("%d %d %d", &n, &r, &q);

	grandes.push_back(0);
	for(int i=1; i<=n; i++) {
		int a;
		if(i!=1)scanf("%d %d", &a, &cor[i]);
		else scanf("%d", &cor[i]);
		if(i!=1) g[i].push_back(a), g[a].push_back(i);
		lista[cor[i]].push_back(i);

		if(lista[cor[i]].size()==1) grandes.push_back(cor[i]), indg[cor[i]]=grandes.size()-1;
	}

	v.push_back(0);
	dfs(1, 1);
	// for(int i=1; i<=n; i++) {
	// 	printf("vertice %d: tam %d // cor %d // ind %d\n   ", i, tam[i], cor[i], ind[i]);
	// 	for(int j=1; j<grandes.size(); j++) printf("%d ", dp[i][j]); printf("\n");
	// }

	for(int i=1; i<=n; i++) {
		for(int j=1; j<grandes.size(); j++) {
			precalc[j][cor[i]]+=dp[i][j];
			// printf("precalc[%d][cor[%d]=%d]= %d\n", j, i, cor[i], precalc[j][cor[i]]);
		}
	}

	// for(int i=1; i<=r; i++) printf("cor %d: lista[].size()= %d // indg[]= %d\n", i, lista[i].size(), indg[i]);

	while(q--) {
		int a, b; scanf("%d %d", &a, &b);
		if(indg[a]) {
			printf("%d\n", precalc[indg[a]][b]);
			fflush(stdout);
			continue;
		}
	}

}

Compilation message (stderr)

regions.cpp: In function 'void dfs(int, int)':
regions.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1; i<grandes.size(); i++) dp[cur][i]=dp[p][i];
               ~^~~~~~~~~~~~~~~
regions.cpp: In function 'int main()':
regions.cpp:51:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int j=1; j<grandes.size(); j++) {
                ~^~~~~~~~~~~~~~~
regions.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d", &n, &r, &q);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:35:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   if(i!=1)scanf("%d %d", &a, &cor[i]);
           ~~~~~^~~~~~~~~~~~~~~~~~~~~~
regions.cpp:36:13: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   else scanf("%d", &cor[i]);
        ~~~~~^~~~~~~~~~~~~~~
regions.cpp:60:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 15
• Subtask 2: 0 / 85