LuoguP1131选择客栈

TLE70

#include<cstdio>
#include<cstring>

int n,k,p,ans,sum[1000005],color[1000005],low[1000005],head[1000005],last[55];

int main(){
    memset(last,-1,sizeof(last));
    scanf("%d%d%d",&n,&k,&p);
    for(int i=1;i<=n;i++){
        scanf("%d%d",&color[i],&low[i]);
        head[i]=last[color[i]];
        last[color[i]]=i;
        sum[i]=sum[i-1];
        if(low[i]<=p)sum[i]++;
        for(int j=head[i];j!=-1;j=head[j]){
            if(sum[i]-sum[j-1])ans++;
    //      printf("ha%d %d\n",i,ans);
        }
    }
    printf("%d\n",ans);
}

WA0

#include<cstdio>
#include<cstring>

int n,k,p,emm,last,pre[55],sum[55],ans[55];

int main(){
    last=-1;
    scanf("%d%d%d",&n,&k,&p);
    for(int i=1;i<=n;i++){
        int x,y;
        scanf("%d%d",&x,&y);
        if(y<=p)last=i;
        if(last>=pre[x])ans[x]+=sum[x];
        emm+=ans[x];
        sum[x]++;
        pre[x]=i;
    }
    printf("%d\n",emm);
}

AC

#include<cstdio>
#include<cstring>

int n,k,p,emm,last,pre[55],sum[55],ans[55];

int main(){
    last=-1;
    scanf("%d%d%d",&n,&k,&p);
    for(int i=1;i<=n;i++){
        int x,y;
        scanf("%d%d",&x,&y);
        if(y<=p)last=i;
        if(last>=pre[x])ans[x]=sum[x];//bushi+=
        emm+=ans[x];
        sum[x]++;
        pre[x]=i;
    }
    printf("%d\n",emm);
}