题意：有 n 个队伍进行比赛，每个队伍比赛数目是一样的，每场恰好一个胜一个负，给定每个队伍当前胜的场数败的数目，以及两个队伍剩下的比赛场数，问你冠军队伍可能是哪些队。
析：对每个队伍 i 进行判断是不是能冠军，最优的情况的就是剩下的比赛全都胜，也就是一共胜的数目就是剩下的要比赛的数再加上原来胜的数目sum，然后把每两个队伍比赛看成一个结点，(u, v)，然后从 s 向 结点加一条容量要打的比赛数目的容量，然后从 (u, v) 向 u 和 v 分别加一条容量为无穷大的边，然后每个 u 向 t 加一条容量为 sum - w[i] ，跑一个最大流，如果是满流是，那么就是有解，也就是 i 可能是冠军。
代码如下：
#pragma comment(linker, "/STACK:1024000000,1024000000")
#include <cstdio>
#include <string>
#include <cstdlib>
#include <cmath>
#include <iostream>
#include <cstring>
#include <set>
#include <queue>
#include <algorithm>
#include <vector>
#include <map>
#include <cctype>
#include <cmath>
#include <stack>
#include <sstream>
#include <list>
#include <assert.h>
#include <bitset>
#include <numeric>
#define debug() puts("++++");
#define gcd(a, b) __gcd(a, b)
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define fi first
#define se second
#define pb push_back
#define sqr(x) ((x)*(x))
#define ms(a,b) memset(a, b, sizeof a)
#define sz size()
#define pu push_up
#define pd push_down
#define cl clear()
#define all 1,n,1
#define FOR(i,x,n) for(int i = (x); i < (n); ++i)
#define freopenr freopen("in.txt", "r", stdin)
#define freopenw freopen("out.txt", "w", stdout)
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
typedef pair<LL, int> P;
const int INF = 0x3f3f3f3f;
const LL LNF = 1e17;
const double inf = 1e20;
const double PI = acos(-1.0);
const double eps = 1e-8;
const int maxn = 25 * 25 + 25 + 50;
const int maxm = 1e6 + 5;
const int mod = 10007;
const int dr[] = {-1, 0, 1, 0};
const int dc[] = {0, -1, 0, 1};
const char *de[] = {"0000", "0001", "0010", "0011", "0100", "0101", "0110", "0111", "1000", "1001", "1010", "1011", "1100", "1101", "1110", "1111"};
int n, m;
const int mon[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
const int monn[] = {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
inline bool is_in(int r, int c) {
return r >= 0 && r < n && c >= 0 && c < m;
}
struct Edge{
int from, to, cap, flow;
};
struct Dinic{
int n, m, s, t;
vector<Edge> edges;
vector<int> G[maxn];
bool vis[maxn];
int d[maxn];
int cur[maxn];
void init(int n){
this-> n = n;
for(int i = 0; i < n; ++i) G[i].cl;
edges.cl;
}
void addEdge(int from, int to, int cap){
edges.pb((Edge){from, to, cap, 0});
edges.pb((Edge){to, from, 0, 0});
m = edges.sz;
G[from].pb(m - 2);
G[to].pb(m - 1);
}
bool bfs(){
ms(vis, 0); d[s] = 0; vis[s] = 1;
queue<int> q;
q.push(s);
while(!q.empty()){
int u = q.front(); q.pop();
for(int i = 0; i < G[u].sz; ++i){
Edge &e = edges[G[u][i]];
if(!vis[e.to] && e.cap > e.flow){
vis[e.to] = 1;
d[e.to] = d[u] + 1;
q.push(e.to);
}
}
}
return vis[t];
}
int dfs(int u, int a){
if(u == t || a == 0) return a;
int flow = 0, f;
for(int &i = cur[u]; i < G[u].sz; ++i){
Edge &e = edges[G[u][i]];
if(d[e.to] == d[u] + 1 && (f = dfs(e.to, min(a, e.cap - e.flow))) > 0){
e.flow += f;
edges[G[u][i]^1].flow -= f;
flow += f;
a -= f;
if(a == 0) break;
}
}
return flow;
}
int maxflow(int s, int t){
this-> s = s;
this-> t = t;
int flow = 0;
while(bfs()){ ms(cur, 0); flow += dfs(s, INF); }
return flow;
}
};
Dinic dinic;
int w[30], d[30];
int a[30][30];
int main(){
int T; cin >> T;
while(T--){
scanf("%d", &n);
int s = 0, t = n * n + n + 1;
for(int i = 1; i <= n; ++i) scanf("%d %d", w + i, d + i);
for(int i = 1; i <= n; ++i)
for(int j = 1; j <= n; ++j)
scanf("%d", a[i] + j);
vector<int> ans;
int mmax = *max_element(w+1, w+n+1);
for(int i = 1; i <= n; ++i){
int sum = accumulate(a[i]+1, a[i]+n+1, w[i]);
if(sum < mmax) continue;
dinic.init(t + 5);
int cnt = 0;
for(int j = 1; j <= n; ++j)
for(int k = j+1; k <= n; ++k){
if(j == i || i == k) continue;
int x = (j-1)*n + k;
dinic.addEdge(s, x, a[j][k]);
dinic.addEdge(x, j + n*n, INF);
dinic.addEdge(x, k + n*n, INF);
cnt += a[j][k];
}
for(int j = 1; j <= n; ++j)
if(i != j) dinic.addEdge(j + n*n, t, sum - w[j]);
if(cnt == dinic.maxflow(s, t)) ans.push_back(i);
}
for(int i = 0; i < ans.sz; ++i)
printf("%d%c", ans[i], " \n"[i+1==ans.sz]);
}
return 0;
}
