比赛 |
20151019 |
评测结果 |
AAAAAAAAAA |
题目名称 |
学数数 |
最终得分 |
100 |
用户昵称 |
dashgua |
运行时间 |
0.423 s |
代码语言 |
C++ |
内存使用 |
4.51 MiB |
提交时间 |
2015-10-19 21:26:34 |
显示代码纯文本
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <vector>
#include <utility>
#include <stack>
#include <queue>
#include <map>
#include <iostream>
#include <algorithm>
template<class Num>void read(Num &x)
{
char c; int flag = 1;
while((c = getchar()) < '0' || c > '9')
if(c == '-') flag *= -1;
x = c - '0';
while((c = getchar()) >= '0' && c <= '9')
x = (x<<3) + (x<<1) + (c-'0');
x *= flag;
}
template<class Num>void write(Num x)
{
if(!x) {putchar('0');return;}
if(x < 0) putchar('-'), x = -x;
static char s[20];int sl = 0;
while(x) s[sl++] = x%10 + '0',x /= 10;
while(sl) putchar(s[--sl]);
}
const int maxn = 1e5 + 20;
int n, q, a[maxn], b[maxn], len;
int stack[maxn], top;
int l[maxn], r[maxn];
long long cnt[maxn], pre[maxn], sur[maxn];
int main()
{
freopen("jxthree.in","r",stdin);
freopen("jxthree.out","w",stdout);
read(n), read(q);
for(int i = 1; i <= n; i++)
read(a[i]), b[i] = a[i];
std::sort(b + 1, b + n + 1);
len = std::unique(b + 1, b + n + 1) - (b + 1);
stack[top = 0] = 0;
for(int i = 1; i <= n; i++)
{
while(top && a[i] > a[stack[top]]) top--;
l[i] = stack[top], stack[++top] = i;
}
stack[top = 0] = n + 1;
for(int i = n; i >= 1; i--)
{
while(top && a[i] >= a[stack[top]]) top--;
r[i] = stack[top], stack[++top] = i;
}
for(int i = 1; i <= n; i++)
{
int x = std::lower_bound(b + 1, b + len + 1, a[i]) - b;
cnt[x] += (long long)(i - l[i])*(r[i] - i);
}
for(int i = 1; i <= len; i++)
pre[i] = pre[i - 1] + cnt[i];
for(int i = len; i >= 1; i--)
sur[i] = sur[i + 1] + cnt[i];
for(int i = 1, k; i <= q; i++)
{
static char s[3];
scanf("%s", s), read(k);
if(s[0] == '>')
{
int x = std::upper_bound(b + 1, b + len + 1, k) - b;
write(sur[x]), puts("");
}
else if(s[0] == '<')
{
int x = std::lower_bound(b + 1, b + len + 1, k) - b - 1;
write(pre[x]), puts("");
}
else
{
int x = std::lower_bound(b + 1, b + len + 1, k) - b;
write((b[x] == k) ? cnt[x] : 0), puts("");
}
}
fclose(stdin);
fclose(stdout);
return 0;
}