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NOIP2014

生活大爆炸版石头剪刀布

  直接模拟即可。

// codevs3716#include<algorithm>#include<iostream>#include<cstdlib>#include<cstring>#include<cstdio>#include<cmath>#define LL long long#define MOD 1000000007#define inf 2147483640#define Pi acos(-1.0)#define free(a) freopen(a".in","r",stdin),freopen(a".out","w",stdout);using namespace std;const int maxn=2000;int c[5][5]={{0,0,1,1,0},			 {1,0,0,1,0},			 {0,1,0,0,1},			 {0,0,1,0,1},			 {1,1,0,0,0}};int a[maxn],b[maxn];int main() {	int n,na,nb;	scanf("%d%d%d",&n,&na,&nb);	for (int i=0;i<na;i++) scanf("%d",&a[i]);	for (int i=0;i<nb;i++) scanf("%d",&b[i]);	int A=0,B=0;	for (int i=0;i<n;i++) {		A+=c[a[i%na]][b[i%nb]];		B+=c[b[i%nb]][a[i%na]];	}	printf("%d %d",A,B);	return 0;}

联合权值

  一开始无脑枚举,因为只需要dfs1层,感觉完全不虚,结果被菊花树卡得只有70分,于是怒水一发树形dp。

// codevs3728#include<algorithm>#include<iostream>#include<cstdlib>#include<cstring>#include<cstdio>#include<cmath>#define LL long long#define MOD 10007#define inf 2147483640#define Pi acos(-1.0)#define free(a) freopen(a".in","r",stdin),freopen(a".out","w",stdout);using namespace std;const int maxn=200010;struct edge {int to,next;}e[maxn<<1];int head[maxn],n,cnt,w[maxn],ans1,ans2;;void link(int u,int v) {	e[++cnt].to=v;e[cnt].next=head[u];head[u]=cnt;	e[++cnt].to=u;e[cnt].next=head[v];head[v]=cnt;}void dfs(int x,int fa,int f) {	ans1=(ans1+w[x]*w[f]);ans2=max(ans2,w[x]*w[f]);	int x1=0,x2=0;	for (int i=head[x];i;i=e[i].next) if (e[i].to!=fa) {			dfs(e[i].to,x,fa);			ans2=max(ans2,x2*w[e[i].to]);			ans1=(ans1+x1*w[e[i].to])%MOD;			x1=(x1+w[e[i].to])%MOD;x2=max(x2,w[e[i].to]);		}}int main() {	scanf("%d",&n);	for (int u,v,i=1;i<n;i++) {		scanf("%d%d",&u,&v);		link(u,v);	}	for (int i=1;i<=n;i++) scanf("%d",&w[i]);	dfs(1,0,0);	printf("%d %d",ans2,ans1*2%MOD);	return 0;}

 飞扬的小鸟

  一开始打了个nm²加队列乱搞可以获得85分的高分哦!正解背包。

// codevs3729#include<algorithm>#include<iostream>#include<cstdlib>#include<cstring>#include<cstdio>#include<cmath>#define LL long long#define inf 100000000#define Pi acos(-1.0)#define free(a) freopen(a".in","r",stdin),freopen(a".out","w",stdout);using namespace std;const int maxn=10010,maxm=1010;struct data {int p,l,r;}t[maxn];int n,m,K,u[maxn],d[maxn],l[maxn],r[maxn],f[maxn][maxm];int main() {	scanf("%d%d%d",&n,&m,&K);	for (int i=0;i<n;i++) scanf("%d%d",&u[i],&d[i]);	for (int i=0;i<=n;i++) l[i]=0,r[i]=m+1;	for (int x,i=1;i<=K;i++) {		scanf("%d",&x);		scanf("%d%d",&l[x],&r[x]);	}	int cnt=0;	for (int i=1;i<=n;i++) {		for (int j=1;j<=m;j++) {			f[i][j]=inf;			if (j>u[i-1]) f[i][j]=min(f[i][j],min(f[i-1][j-u[i-1]],f[i][j-u[i-1]])+1);		}		for (int j=m-u[i-1];j<=m;j++) f[i][m]=min(f[i][m],min(f[i-1][j],f[i][j])+1);		for (int j=l[i]+1;j<=r[i]-1;j++)			if (j+d[i-1]<=m) f[i][j]=min(f[i][j],f[i-1][j+d[i-1]]);		for (int j=1;j<=l[i];j++) f[i][j]=inf;		for (int j=r[i];j<=m;j++) f[i][j]=inf;		int flag=0;		for (int j=1;j<=m;j++) if (f[i][j]<inf) {flag=1;break;}		if (!flag) {printf("0\n%d",cnt);return 0;}		else if (r[i]!=m+1) cnt++;	}	int ans=inf;	for (int i=1;i<=m;i++) ans=min(ans,f[n][i]);	printf("1\n%d",ans);	return 0;}

  

NOIP2014