【BZOJ 1061】[Noi2008] 志愿者招募



#define LL long long
using namespace std;

const int N = 1000+9;
const int M = 100000; 
const int INF = 1e9;

int head[N],nxt[M],to[M],flow[M],cost[M],dis[N];
int n,m,S,T,ned[N],inq[N],sur[N],FLOW[N];
queue<int> que;

inline int read(){
	char c=getchar(); int ret=0,f=1;
	while (c<'0'||c>'9') {if(c=='-')f=-1;c=getchar();}
	while (c<='9'&&c>='0') {ret=ret*10+c-'0';c=getchar();}
	return ret*f;
inline void Add_Edge(int u, int v, int f, int c) {
    static int TT = 1;
    to[++TT] = v; nxt[TT] = head[u]; head[u] = TT; flow[TT] = f; cost[TT] = c;
    to[++TT] = u; nxt[TT] = head[v]; head[v] = TT; flow[TT] = 0; cost[TT] = -c;
inline int SPFA() {
    que.push(S); dis[S] = 0; inq[S] = 1; FLOW[S] = INF;
    while (!que.empty()) {
        int w = que.front(); que.pop(); inq[w] = 0;
        for (int i=head[w];i;i=nxt[i]) if (flow[i] && dis[w] + cost[i] < dis[to[i]]) {
            dis[to[i]] = dis[w] + cost[i]; sur[to[i]] = i;
            FLOW[to[i]] = min(FLOW[w], flow[i]);
            if (!inq[to[i]]) que.push(to[i]), inq[to[i]] = 1;
    } return FLOW[T]; 
inline int MCMF() {
    int ret = 0;
    for (int w=T,f;f=SPFA();w=T) for (int t=sur[w];w!=S;t=sur[w]) 
        flow[t] -= f, flow[t^1] += f, ret += cost[t]*f, w = to[t^1];
    return ret;

int main(){
	n = read(); m = read(); S = 0; T = N-1;
	for (int i=1;i<=n;i++) ned[i] = read();
	for (int i=n+1;i;i--) ned[i] = ned[i-1] - ned[i];
	for (int i=1;i<=n+1;i++) if (ned[i] > 0) Add_Edge(S,i,ned[i],0); else Add_Edge(i,T,-ned[i],0);
	for (int i=1;i<=n;i++) Add_Edge(i,i+1,INF,0);  
	for (int i=1,s,t,c;i<=m;i++) s = read(), t = read(), c = read(), Add_Edge(t+1,s,INF,c);
	return 0;

22 thoughts to “【BZOJ 1061】[Noi2008] 志愿者招募”

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