明明多个几秒就能场上AK了。自闭。
A:签到。
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int T,l,r,d; signed main() { /*#ifndef ONLINE_JUDGE freopen("a.in","r",stdin); freopen("a.out","w",stdout); const char LL[]="%I64d\n"; #endif*/ T=read(); while (T--) { l=read(),r=read(),d=read(); if (d<l) cout<<d<<endl; else cout<<1ll*(r/d+1)*d<<endl; } return 0; //NOTICE LONG LONG!!!!! }
B:签到。
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long #define N 500010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int n; char s[N]; signed main() { /*#ifndef ONLINE_JUDGE freopen("a.in","r",stdin); freopen("a.out","w",stdout); const char LL[]="%I64d\n"; #endif*/ scanf("%s",s+1);n=strlen(s+1); bool flag=0;int x=n+1,y=0; for (int i=1;i<=n;i++) { if (s[i]==‘[‘) flag=1; if (s[i]==‘:‘) if (flag) {x=i;break;} } flag=0; for (int i=n;i>=1;i--) { if (s[i]==‘]‘) flag=1; if (s[i]==‘:‘) if (flag) {y=i;break;} } if (x>=y) cout<<-1; else { int ans=4; for (int i=x+1;i<y;i++) if (s[i]==‘|‘) ans++; cout<<ans; } return 0; //NOTICE LONG LONG!!!!! }
C:wa了无数发。按左端点排序后找一个连续且和其他线段不相交的线段集即可。
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long #define N 100010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int T,n,ans[N]; struct data { int l,r,i; bool operator <(const data&a) const { return l<a.l; } }a[N]; signed main() { #ifndef ONLINE_JUDGE freopen("a.in","r",stdin); freopen("a.out","w",stdout); const char LL[]="%I64d\n"; #endif T=read(); while (T--) { n=read(); for (int i=1;i<=n;i++) a[i].l=read(),a[i].r=read(),a[i].i=i; sort(a+1,a+n+1); bool flag=0;a[n+1].l=100000000; int t=1,x=a[1].r; while (t<n&&a[t+1].l<=x) t++,x=max(x,a[t].r); if (t==n) cout<<-1<<endl; else { for (int i=1;i<=t;i++) ans[a[i].i]=1; for (int i=t+1;i<=n;i++) ans[a[i].i]=2; for (int i=1;i<=n;i++) printf("%d ",ans[i]); cout<<endl; } } return 0; //NOTICE LONG LONG!!!!! }
E:这才是真签到吧?wa了一发自闭啊?
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long #define N 500010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int m,u,v; signed main() { #ifndef ONLINE_JUDGE freopen("b.in","r",stdin); freopen("b.out","w",stdout); const char LL[]="%I64d\n"; #endif m=read(); while (m--) { char c=getchar();while (c!=‘+‘&&c!=‘?‘) c=getchar(); int x=read(),y=read();if (x>y) swap(x,y); if (c==‘+‘) { u=max(u,x),v=max(y,v); } else { if (x>=u&&y>=v) printf("YES\n"); else printf("NO\n"); } } return 0; //NOTICE LONG LONG!!!!! }
D:如果路径经过某点,最后所得的路径gcd显然是该点某些质因子的倍数。对此dp即可。一发wa on 3,3可是样例啊?自闭了啊?
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long #define N 200010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int n,a[N],p[N],f[N][30],prime[N][30],t,ans; struct data{int to,nxt; }edge[N<<1]; void addedge(int x,int y){t++;edge[t].to=y,edge[t].nxt=p[x],p[x]=t;} void dfs(int k,int from) { for (int i=p[k];i;i=edge[i].nxt) if (edge[i].to!=from) { dfs(edge[i].to,k); for (int x=1;x<=prime[edge[i].to][0];x++) for (int y=1;y<=prime[k][0];y++) if (prime[edge[i].to][x]==prime[k][y]) { ans=max(ans,f[k][y]+f[edge[i].to][x]+1); f[k][y]=max(f[k][y],f[edge[i].to][x]+1); } } } signed main() { #ifndef ONLINE_JUDGE freopen("a.in","r",stdin); freopen("a.out","w",stdout); const char LL[]="%I64d\n"; #endif n=read(); for (int i=1;i<=n;i++) a[i]=read(); bool flag=1; for (int i=1;i<=n;i++) if (a[i]!=1) flag=0; if (flag) {cout<<0;return 0;} for (int i=1;i<n;i++) { int x=read(),y=read(); addedge(x,y),addedge(y,x); } for (int i=1;i<=n;i++) { for (int j=2;j*j<=a[i];j++) if (a[i]%j==0) { prime[i][++prime[i][0]]=j; while (a[i]%j==0) a[i]/=j; } if (a[i]>1) prime[i][++prime[i][0]]=a[i]; } dfs(1,1); cout<<ans+1; return 0; //NOTICE LONG LONG!!!!! }
G:一眼线性基,然后就往别的方面想了。自闭了半天直接乱搞求个前缀和搞了个线性基上去就pp了。冷静了半天正确性何在。事实上划分序列相当于选出一些前缀和,这是一个裸到不行的线性基。注意虽然最后一个前缀和应该是必须选的,但是不考虑也不会造成什么影响(吧)。
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> using namespace std; #define ll long long #define N 200010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int n,a[N],base[32],ans; signed main() { #ifndef ONLINE_JUDGE freopen("a.in","r",stdin); freopen("a.out","w",stdout); const char LL[]="%I64d\n"; #endif n=read(); for (int i=1;i<=n;i++) a[i]=a[i-1]^read(); if (a[n]==0) {cout<<-1;return 0;} for (int i=1;i<=n;i++) for (int j=30;~j;j--) if (a[i]&(1<<j)) { if (base[j]) a[i]^=base[j]; else {base[j]=a[i],ans++;break;} } cout<<ans; return 0; //NOTICE LONG LONG!!!!! }
F:随便都知道是二分答案。但是nmlog显然有些吃力。考虑random_shuffle一发,每次记录当前需要的最大容量,考虑下一辆卡车时先判断当前容量是否能满足其需求,如果不行再二分一下。这样复杂度大约是nm+nlogmlogV,因为只需要对所需容量的单调栈中的卡车进行二分,而排列又是随机的。复杂度证明似乎在一篇cfblog里看到过。(突然发现整个idea都在这篇blog里https://codeforces.com/blog/entry/62602)一开始又没注意到要开long long,交一发in queue了半天,然后wa on 3,结果改了一发又没改全,交一发再次in queue了半天,接着wa on 3。然后就只剩20s了,手速不行,就,自闭了。
#include<iostream> #include<cstdio> #include<cmath> #include<cstdlib> #include<cstring> #include<algorithm> #include<ctime> using namespace std; #define ll long long #define N 410 #define M 250010 char getc(){char c=getchar();while ((c<‘A‘||c>‘Z‘)&&(c<‘a‘||c>‘z‘)&&(c<‘0‘||c>‘9‘)) c=getchar();return c;} int gcd(int n,int m){return m==0?n:gcd(m,n%m);} int read() { int x=0,f=1;char c=getchar(); while (c<‘0‘||c>‘9‘) {if (c==‘-‘) f=-1;c=getchar();} while (c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=getchar(); return x*f; } int n,m,a[N]; ll ans; struct data{int s,f,c,r; }b[M]; bool check(ll k,int i) { ll cur=k;int cnt=0; for (int j=b[i].s;j<b[i].f;j++) { if (cur>=1ll*b[i].c*(a[j+1]-a[j])) cur-=1ll*b[i].c*(a[j+1]-a[j]); else { cur=k,cnt++; if (cur>=1ll*b[i].c*(a[j+1]-a[j])) cur-=1ll*b[i].c*(a[j+1]-a[j]); else return 0; } if (cnt>b[i].r) return 0; } return 1; } signed main() { #ifndef ONLINE_JUDGE freopen("b.in","r",stdin); freopen("b.out","w",stdout); const char LL[]="%I64d\n"; #endif srand(time(0)); n=read(),m=read(); for (int i=1;i<=n;i++) a[i]=read(); for (int i=1;i<=m;i++) b[i].s=read(),b[i].f=read(),b[i].c=read(),b[i].r=read(); random_shuffle(b+1,b+m+1); for (int i=1;i<=m;i++) if (!check(ans,i)) { ll l=ans+1,r=1000000000000000000ll; while (l<=r) { ll mid=l+r>>1; if (check(mid,i)) ans=mid,r=mid-1; else l=mid+1; } } cout<<ans; return 0; //NOTICE LONG LONG!!!!! }
原文地址:https://www.cnblogs.com/Gloid/p/10258416.html
时间: 2024-11-02 11:11:35