int read() { char ch = getchar(); int x = 0, f = 1; while(ch < '0' || ch > '9') { if(ch == '-') f = -1; ch = getchar(); } while('0' <= ch && ch <= '9') { x = x * 10 + ch - '0'; ch = getchar(); } return x * f; }
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转载自www.cnblogs.com/mogeko/p/11368805.html
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