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类型最大值/最小值: #include "limits.h"
#include "limits.h"
INT_MAX
INT_MIN
万能头文件: #include <bits/stdc++.h>
#include <bits/stdc++.h>
int sum, a;
sum = sum + a
sum += a
sum = sum * a
sum *= a
sum = sum - a
sum -= a
sum = sum / a
sum /= a