2018百度之星程序设计大赛资格赛（4道题的答案）

目前是百度之星的资格赛比赛时间，写对一道题就可以进入后面的比赛了，我们初赛再见咯。明明昨天就上传该文章，可惜图片太多一直列为待审核，现在图片都删了，日后再来详细补充题目吧。

调查问卷

#include <bits/stdc++.h>
using namespace std;

#define se second
#define fi first
#define ll long long
const int MAXN = (int)1e3+10;
int n, m, k;
char s[MAXN][11];
int dp[MAXN][11];
int arr[MAXN];
map<int, int> mp;

signed main() {
    int T, kk = 0;
    scanf("%d",&T);
    while(T--) {
        cin >> n >> m >> k;
        for(int i = 0; i < n; i++) {
            scanf("%s", s[i]);
        }
        int ans = 0;
        for(int i = 1; i < 1 << m; i++) {
            int zz = 0;
            for(int j = 0; j < m; j++) {
                if(i & (1 << j)) {
                    for(int l = 0; l < n; l++) {
                        dp[l][zz] = s[l][j] - 'A' + 1;
                    }
                    zz++;
                }
            }
            memset(arr, 0, sizeof arr);
            for(int j = 0; j < n; j++) {
                for(int l = 0; l < zz; l++) {
                    arr[j] <<= 1;
                    arr[j] |= (dp[j][l] == 1 ? 1 : 0);
                }
            }
            mp.clear();
            for(int j = 0; j < n; j++) mp[arr[j]]++;
            int tmp = 0;
            for(auto it = mp.begin(); it != mp.end(); ++it) {
                tmp += (n - it->se) * it->se;
            }
            if(tmp / 2 >= k) ans++;
        }
        printf("Case #%d: %d\n", ++kk, ans);
    }
    return 0;
}

字串查询

#include<bits/stdc++.h>
using namespace std;
#define LL long long 
#define pb push_back
#define inf 0x3f3f3f3f
char s[100010];
LL f[100010][26];
int main(){
    int t,n,q,m,i,j,k,cas=0,l,r;
    scanf("%d",&t);
    while(t--){
        scanf("%d%d%s",&n,&q,s+1);
        for(i=1;i<=n;++i){
            for(j=0;j<26;++j) f[i][j]=f[i-1][j];
            f[i][s[i]-'A']++;
        }
        printf("Case #%d:\n",++cas);
        while(q--){
            scanf("%d%d",&l,&r);
            LL ans=0;
            for(i=0;i<26;++i){
                if(f[r][i]-f[l-1][i]){
                    ans=f[r][i]-f[l-1][i];
                    break;
                }
            }
            printf("%I64d\n",ans);
        }
    }
    return 0;
}

序列计数

#include<bits/stdc++.h>
using namespace std;
#define LL long long
#define pb push_back
#define inf 0x3f3f3f3f
LL mod=1e9+7;
int a[10010],N,M;
LL C[10010],ans[10010],f[2][10010];
inline int lowbit(int x){return x&-x;};
inline void add(int x,LL d){
    while(x<=N){
        C[x]+=d;
        C[x]%=mod;
        x+=lowbit(x);
    }
}
inline LL sum(int x){
    LL r=0;
    while(x){
        r+=C[x];
        r%=mod;
        x-=lowbit(x);
    }
    return r;
}
inline void scan_d(int &ret)
{
    char c;
    ret = 0;
    while ((c = getchar()) < '0' || c > '9');
    while (c >= '0' && c <= '9')
    {
        ret = ret * 10 + (c - '0'), c = getchar();
    }
}
int main(){
    int t,n,m,i,j,k,cas=0;
    char ch;
    scanf("%d",&t);
    while(t--){
        scanf("%d",&n);
        N=n;
        for(i=1;i<=n;++i) scan_d(a[i])/*scanf("%d",a+i)*/,f[0][i]=1;
        ans[1]=n;
        int cur=1;
        for(int len=2;len<=n;++len){
            ans[len]=0;
            if(ans[len-1]==0) continue;
            for(i=1;i<=n;++i){
                LL tmp=sum(a[i]-1);
                ans[len]+=tmp;
                add(a[i],f[cur^1][i]);
                f[cur][i]=tmp;

            }
            for(i=1;i<=n;++i)C[i]=0;
            cur^=1;
        }
        printf("Case #%d:",++cas);
        for(i=1;i<=n;++i) printf(" %I64d",ans[i]%mod);
        cout<<endl;
    }
    return 0;
}

三原色图

#include<bits/stdc++.h>
using namespace std;
#define LL long long 
#define pb push_back
#define inf 0x3f3f3f3f
int f[111];
int getf(int u){return f[u]==u?u:f[u]=getf(f[u]);}
struct Edge{
    int u,v,w,col,sel;
    bool operator<(const Edge& C)const{
        return w<C.w;
    }
}e[110];
int ans[110],N,M;
void mst(int no){
    int cnt=0,cnw=0;
    for(int i=1;i<=N;++i)f[i]=i;
    for(int i=1;i<=M;++i)e[i].sel=0;
    for(int i=1;cnt<N-1&&i<=M;++i){
        if(e[i].col==no) continue;
        int fu=getf(e[i].u),fv=getf(e[i].v);
        if(fu!=fv){
            e[i].sel=1;
            cnt++;
            cnw+=e[i].w;
            f[fv]=fu;
        }
    }
    if(cnt!=N-1) return;
    if(ans[cnt]==-1) ans[cnt]=cnw;
    else ans[cnt]=min(ans[cnt],cnw);
    for(int i=1;i<=M;++i){
        if(e[i].sel) continue;
        cnt++;
        cnw+=e[i].w;
        if(ans[cnt]==-1) ans[cnt]=cnw;
        else ans[cnt]=min(ans[cnt],cnw);
    }
}
int main(){
    int t,n,m,i,j,k,cas=0;
    char ch;
    scanf("%d",&t);
    while(t--){
        scanf("%d%d",&n,&m);
        N=n,M=m;
        for(i=1;i<=m;++i){
            scanf("%d%d%d",&e[i].u,&e[i].v,&e[i].w);

            cin>>ch;
            if(ch=='R') e[i].col=0;
            else if(ch=='G') e[i].col=1;
            else if(ch=='B') e[i].col=2;
        }
        sort(e+1,e+1+m);
        memset(ans,-1,sizeof(ans));
        mst(0);
        mst(2);

        printf("Case #%d:\n",++cas);
        for(i=1;i<=m;++i) printf("%d\n",ans[i]);
    }
    return 0;
}