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class Solution {

public int strToInt(String str) {

str = str.trim();

if(str.equals("")){

return 0;

}

int n = str.length();

int p = 0;

char[] chs = str.toCharArray();

int res = 0;

int flag = 1;

if(chs[p]=='-'){

flag = -1;

p++;

}else if(chs[p]=='+'){

p++;

}

for(; p<n; p++){

char ch = chs[p];

if(ch>='0' && ch<='9'){

//溢出判断

if(flag==1){

//res * 10 + cur > max

if(res>(Integer.MAX_VALUE - (ch-'0'))/10){

return Integer.MAX_VALUE;

}

}else{

//-res * 10 - cur < min

if(-res<(Integer.MIN_VALUE + ch - '0')/10){

return Integer.MIN_VALUE;

}

}

res = res*10 + ch - '0';

}else{

break;

}

}

return res*flag;

}

}