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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#700565 | #9315. Rainbow Bracket Sequence | LETTER | WA | 1ms | 3716kb | C++20 | 3.7kb | 2024-11-02 13:10:13 | 2024-11-02 13:10:14 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define int ll
const int N = 305, M = 505, inf = 1E9;
int cnt, h[N], cur[N], dis[N], vis[N], nxt[M << 1], vs[M << 1], cap[M << 1], cost[M << 1]; // 注意是否会RE,MLE
int S, T, mincost;
int n, m; //!!!不要在栈内 int S,T
void init() //!!!
{
cnt = 0;
mincost = 0;
memset(nxt, -1, sizeof nxt); // 注意多测是否会超时
memset(h, -1, sizeof h); // 注意多测是否会超时
}
void addedge(int u, int v, int w, int c)
{
vs[cnt] = v;
cap[cnt] = w;
cost[cnt] = c;
nxt[cnt] = h[u];
h[u] = cnt++;
vs[cnt] = u;
cap[cnt] = 0;
cost[cnt] = -c;
nxt[cnt] = h[v];
h[v] = cnt++;
}
bool spfa()
{
for (int i = 0; i < N; i++)
{
dis[i] = inf; // 注意多测是否会超时
}
queue<int> q;
dis[S] = 0;
q.push(S);
vis[S] = 1;
while (!q.empty())
{
auto u = q.front();
q.pop();
vis[u] = 0;
for (int i = h[u]; ~i; i = nxt[i])
{
int v = vs[i], w = cost[i];
if (dis[v] > dis[u] + w && cap[i])
{
dis[v] = dis[u] + w;
if (!vis[v])
{
vis[v] = 1;
q.push(v);
}
}
}
}
return dis[T] != inf;
}
int dfs(int u, int flow)
{
if (u == T || (!flow))
{
return flow;
}
int ret = 0;
vis[u] = 1;
for (int &i = cur[u]; ~i; i = nxt[i])
{
int v = vs[i], d, w = cost[i];
if (!vis[v] && cap[i] && dis[v] == dis[u] + w && (d = dfs(v, min(flow - ret, cap[i]))))
{
ret += d;
cap[i] -= d;
mincost += d * w; //<long long
cap[i ^ 1] += d;
if (ret == flow)
{
vis[u] = 0; //!!!
return ret;
}
}
}
vis[u] = 0;
return ret;
}
void dinic(int sum)
{
int ret = 0;
while (spfa())
{
memcpy(cur, h, sizeof h); // 注意多测是否会超时
ret += dfs(S, inf);
}
if (ret < n)
{
cout << -1 << "\n";
}
else
{
cout << sum - mincost << "\n";
}
}
void solve()
{
// 左括号下界转为右括号上界
// 每个点向对应颜色连边,容量为1,流量为1表示此处有一个右括号,单位流量费用为此处的价值
// ans=sum-mincost,最小费用即最大价值
// 因为1 2 3 4 5 6最多有0 1 1 2 2 3个右括号
// 所以i向i-1连边,容量为(i-1)/2
// 颜色向T连边,容量为右括号上界
init();
cin >> n >> m;
vector<int> cnt(m + 1), val(2 * n + 1), col(2 * n + 1);
for (int i = 1; i <= m; i++)
{
cin >> cnt[i];
cnt[i] *= -1;
}
for (int i = 1; i <= 2 * n; i++)
{
cin >> col[i];
cnt[col[i]]++;
}
int sum = 0;
for (int i = 1; i <= 2 * n; i++)
{
cin >> val[i];
sum += val[i];
}
S = 0, T = N - 1;
for (int i = 1; i <= 2 * n; i++)
{
addedge(i, 2 * n + col[i], 1, val[i]);
}
addedge(S, 2*n, n, 0);
for (int i = 2; i <= 2 * n; i++)
{
addedge(i, i - 1, (i - 1) / 2, 0);
}
for (int i = 1; i <= m; i++)
{
addedge(2 * n + i, T, cnt[i], 0);
if (cnt[i] < 0)
{
cout << -1 << "\n";
return;
}
}
dinic(sum);
}
signed main()
{
ios::sync_with_stdio(false), cin.tie(nullptr);
int t = 1;
cin >> t;
while (t--)
{
solve();
}
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 3672kb
input:
2 3 2 1 2 1 2 2 2 1 2 3 1 4 2 2 1 3 2 2 2 1 2 2 2 1 2 3 1 4 2 2 1
output:
9 -1
result:
ok 2 number(s): "9 -1"
Test #2:
score: -100
Wrong Answer
time: 1ms
memory: 3716kb
input:
50 8 6 0 2 2 0 3 1 3 5 1 1 5 3 5 2 3 2 2 1 2 2 4 6 998133227 879226371 59632864 356493387 62611196 827258251 296576565 204244054 812713672 780267148 614679390 447700005 102067050 544546349 116002772 761999375 1 1 1 1 1 343766215 374461155 3 1 2 1 1 1 1 1 1 796323508 303640854 701432076 853325162 610...
output:
-1 343766215 2351080746 3426965219 -1 -1 1351561190 2539318868 1013080942 -1 -1 -1 2231197660 2719131728 3983627641 -1 -1 1046749330 6115214757 3920988203 -1 3902088946 -1 2566553992 -1 5977120748 7505501534 -1 5054275471 1467678317 883992368 1044562986 -1 4024634503 -1 1447294256 6757607722 3688048...
result:
wrong answer 10th numbers differ - expected: '4656646546', found: '-1'