快读:
void read(int &x) {
x = 0; int f = 1; char ch = getchar();
while(ch < '0' || ch > '9'){
if(ch == '-') f = -1;
ch = getchar();
}
while(ch >= '0' && ch <= '9')
x = (x << 1) + (x << 3) + (ch ^ 48), ch = getchar();
x = x * f;
}
快输:
void write(int x) {
if (x < 0) putchar('-'), x = -x;
if (x > 9) write(x / 10);
putchar(char(x % 10 + '0'));
}
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