快读模板

#include <cstdio>

inline int read()
{
    int s = 0, w = 1;
    char ch = getchar();
    while (ch<'0' || ch>'9') { if (ch == '-')w = -1; ch = getchar(); }
    while (ch >= '0'&&ch <= '9') s = s * 10 + ch - '0', ch = getchar();
    return s * w;
}