#include <bits/stdc++.h>
#define fr first
#define sc second
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define endl '\n'
#define sz(x) (int)((x).size())
#define vec vector
#define pw(x) (1ll << x)
using namespace std;
template <typename T> inline bool umin (T &a, const T &b) { if (a > b) { a = b; return 1; } return 0; }
template <typename T> inline bool umax (T &a, const T &b) { if (a < b) { a = b; return 1; } return 0; }
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef pair <int, int> pii;
const int N = 3e4 + 2e3 + 10;
vec <int> g[N];
int used[N], mt[N], active[N], us = 0;
inline bool kuhn (int v) {
if (used[v] == us) return 0;
used[v] = us;
for (auto &u : g[v]) if (active[u] && (!~mt[u] || kuhn(mt[u])) { mt[u] = v; return 1; }
return 0;
}
inline void solve () {
int n, m, k; cin >> n >> m >> k;
for (int i = 0; i < k; ++i) {
int u, v; cin >> u >> v; --u, --v;
g[v].pb(u);
}
fill(mt, mt + N, -1);
vec <int> girls;
for (int i = 0; i < m; ++i) girls.pb(i);
ll ans = 0;
for (int l = 0, r = 0; l < n; ++l) {
while (r < n) {
active[r] = 1;
while (sz(girls)) {
++us;
int go = girls.back();
if (kuhn(go)) girls.pop_back();
else break;
}
if (!sz(girls)) break;
++r;
}
if (sz(girls)) break;
ans += n - r;
if (~mt[l]) {
girls.pb(mt[l]);
mt[l] = -1;
active[l] = 0;
}
}
cout << ans << endl;
}
signed main () {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifdef LOCAL
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif// LOCAL
int t = 1; //cin >> t;
while (t--) solve();
return 0;
}
Compilation message
marriage.cpp: In function 'bool kuhn(int)':
marriage.cpp:28:67: error: expected ';' before '{' token
28 | for (auto &u : g[v]) if (active[u] && (!~mt[u] || kuhn(mt[u])) { mt[u] = v; return 1; }
| ^~
| ;
marriage.cpp:29:5: error: expected primary-expression before 'return'
29 | return 0;
| ^~~~~~
marriage.cpp:28:92: error: expected ')' before 'return'
28 | for (auto &u : g[v]) if (active[u] && (!~mt[u] || kuhn(mt[u])) { mt[u] = v; return 1; }
| ~ ^
| )
29 | return 0;
| ~~~~~~
marriage.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type]
30 | }
| ^
