75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
#include <cstdio>
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#include <deque>
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#include <set>
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#include <string>
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#include <map>
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#include <vector>
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#include <cstring>
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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#include <queue>
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#include <stack>
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using namespace std;
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typedef long long LL;
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template<class T> inline T& RD(T &x){
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char c; for (c = getchar(); c < '0'; c = getchar()); x = c - '0'; for (c = getchar(); '0' <= c && c <= '9'; c = getchar()) x = x * 10 + c - '0';
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return x;
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}
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const int inf = 0x3f3f3f3f;
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const int maxn = 100005;
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int ra[maxn];
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int d[maxn];
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int fa[maxn];
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vector<int> v[maxn];
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int dfs(int u){
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ra[u] = 0;
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for(int i=0;i<v[u].size();i++){
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ra[u]= max(dfs(v[u][i])+1,ra[u]);
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}
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return ra[u];
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}
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int main(){
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int T;
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scanf("%d",&T);
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while(T --){
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int n,e,m;
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scanf("%d%d%d",&n,&e,&m);
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memset(ra,0,sizeof(ra));
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memset(d,0,sizeof(d));
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memset(fa,0,sizeof(fa));
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for(int i=1;i<=n;i++)v[i].clear();
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for(int i=0;i<e;i++){
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int a,b;
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scanf("%d%d",&a,&b);
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v[b].push_back(a);
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fa[a] = 1;
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}
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for(int i=1;i<=n;i++){
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if(fa[i] == 0)dfs(i);
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}
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int _max = 0;
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for(int i=1;i<=n;i++){
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d[ra[i]] ++;
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_max = max(_max,ra[i]);
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}
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int cnt = 0,lft = 0;
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for(int i=0;i<=_max;i++){
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int td = d[i];
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if(cnt > i){
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d[i] -= lft;
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if(d[i] < 0){
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lft -= td;
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continue;
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}
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}
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cnt += d[i]/m;
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if(d[i]%m)cnt ++;
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lft = m - d[i]%m;
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if(lft == m)lft = 0;
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}
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printf("%d\n", cnt);
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}
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return 0;
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}
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