CSU 1081: 集训队分组 1082: 憧憬一下集训 1086: 超市购物 1087: 就多了两分钟

1081: 集训队分组

# include 
# include 
# include 
# include 

# define N 1005

using namespace std;

vector<int> g[N];
char vis[N];

int bfs(int u)
{
    int i, cx, nx, ret;
    int Q[N], front, rear;

    Q[1] = u;

    memset(vis, 0, sizeof(vis));
    vis[u] = 1;

    front = 1;
    rear  = 2;

    ret = 0;
    while (front < rear)
    {
        cx = Q[front++];
        for (i = 0; i < g[cx].size(); ++i)
        {
            nx = g[cx][i];
            if (!vis[nx])
            {
                Q[rear++] = nx;
                vis[nx] = 1;
                ++ret;
            }
        }
    }

    return ret;
}

int main()
{
    int i, n, u, v, k, m, cnt;

    while (~scanf("%d%d%d", &n, &k, &m))
    {
        for (i = 1; i <= n; ++i) g[i].clear();
        for (i = 0; i < m; ++i)
        {
            scanf("%d%d", &u, &v);
            g[u].push_back(v);
        }
        cnt = 0;
        for(i = 1; i <= n; ++i)
        {
            if (bfs(i) >= n-k) ++cnt;
            if (cnt >= k) break;
        }
        puts(cnt>=k ? "YES":"NO");
    }

    return 0;
}
/**********************************************************************
	Problem: 1081
	User: 3901140225
	Language: C++
	Result: AC
	Time:164 ms
	Memory:2180 kb
**********************************************************************/

1082: 憧憬一下集训

#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
  
using namespace std;  
typedef long long LL;  
typedef pair<int, int> PII;  
  
const int MX = 2e4 + 5;  
#define lson l,m,rt<<1  
#define rson m+1,r,rt<<1|1  
#define root 0,10000,1  
  
int MAX[MX << 2], col[MX << 2];  
  
struct Que {  
    int L, R, top, d;  
    bool operator<(const Que &b)const {  
        if(top == b.top) return d > b.d;  
        return top < b.top;  
    }  
    Que(int _top = 0, int _L = 0, int _R = 0, int _d = 0) {  
        L = _L; R = _R; top = _top; d = _d;  
    }  
} Q[MX];  
  
void push_up(int rt) {  
    MAX[rt] = max(MAX[rt << 1], MAX[rt << 1 | 1]);  
}  
  
void push_down(int rt) {  
    if(col[rt]) {  
        col[rt << 1] += col[rt];  
        col[rt << 1 | 1] += col[rt];  
        MAX[rt << 1] += col[rt];  
        MAX[rt << 1 | 1] += col[rt];  
        col[rt] = 0;  
    }  
}  
  
void update(int L, int R, int d, int l, int r, int rt) {  
    if(L <= l && r <= R) {  
        MAX[rt] += d;  
        col[rt] += d;  
        return;  
    }  
  
    int m = (l + r) >> 1;  
    push_down(rt);  
    if(L <= m) update(L, R, d, lson);  
    if(R > m) update(L, R, d, rson);  
    push_up(rt);  
}  
  
int main() {  
    int n;  
    //freopen("input.txt", "r", stdin);  
    while(~scanf("%d", &n)) {  
        memset(MAX, 0, sizeof(MAX));  
        memset(col, 0, sizeof(col));  
  
        for(int i = 1; i <= n; i++) {  
            int x1, x2, y1, y2;  
            scanf("%d%d%d%d", &x1, &x2, &y1, &y2);  
            Q[i] = Que(y1, x1, x2, 1);  
            Q[i + n] = Que(y2, x1, x2, -1);  
        }  
        sort(Q + 1, Q + 1 + 2 * n);  
  
        int ans = 0;  
        for(int i = 1; i <= 2 * n; i++) {  
            update(Q[i].L, Q[i].R, Q[i].d, root);  
            ans = max(ans, MAX[1]);  
        }  
        printf("%d\n", ans);  
    }  
    return 0;  
}  
/**********************************************************************
	Problem: 1082
	User: 3901140225
	Language: C++
	Result: AC
	Time:812 ms
	Memory:2960 kb
**********************************************************************/

1086: 超市购物

#include 
#include 
#include 
using namespace std;
const int MAXN=35;
const int MAXM=2005;
int weight[MAXN][MAXN],value[MAXN][MAXN];
int dp[MAXM];
int main()
{
        int k,m;
        int c=1;
        while(scanf("%d%d",&k,&m)>0)
        {
                memset(dp,0,sizeof(dp));
                memset(weight,0,sizeof(weight));
                memset(value,0,sizeof(value));
                for(int i=1;i<=k;i++)
                {
                        int n;
                        scanf("%d",&n);
                        weight[i][0]=n;
                        for(int j=1;j<=n;j++)
                                scanf("%d%d",&weight[i][j],&value[i][j]);
                }
                for(int i=1;i<=k;i++)
                        for(int j=m;j>=0;j--)
                                for(int p=1;p<=weight[i][0];p++)
                                        if(weight[i][p]<=j)
                                                dp[j]=max(dp[j],dp[j-weight[i][p]]+value[i][p]);
                printf("Case %d: %d\n\n",c++,dp[m]);
        }
        return 0;
}

/**********************************************************************
	Problem: 1086
	User: 3901140225
	Language: C++
	Result: AC
	Time:64 ms
	Memory:1136 kb
**********************************************************************/

1087: 就多了两分钟

#include 
#include 
using namespace std;

int main()
{
    int h1,m1,h2,m2;
    int kase=0;
    //freopen("data/1087.txt","r",stdin);
    while(cin>>h1>>m1>>h2>>m2)
    {
        printf("Day %d: ",++kase);
        if(h1>h2||h1==h2&&m1>m2)
        {
            cout<<"Joking"<<endl;
            continue;
        }
        int t=(h2-h1)*60+m2-m1;
        int ans=t/30;
        int last=t%30;
        if(last)
            last=30-t%30;
        if(last!=0&&last!=30)
            ans++;

        cout<" "<endl;
    }
    return 0;
}

/**********************************************************************
	Problem: 1087
	User: 3901140225
	Language: C++
	Result: AC
	Time:80 ms
	Memory:2024 kb
**********************************************************************/