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yiyiyi4321的解法说明1+2+3+4+5+6+7+8+9+10....因为在A中少加一数X(只能有+,-不加必减)相当于A-2X=B; 要让X存在.A-B必为偶数.只要有一数A能减去给出的数B的结果C为偶数的话就一定可了. #include<iostream.h> void main() { int n,i,sum; cin>>n; sum=0; for(i=1;sum<n||((sum-n)%2==1);i++)//小于||相差为奇数 sum+=i; cout<<i-1<<endl; } Followed by:
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