/in/foo.cc:10:39: error: stray '\357' in program
 int w[MAXN], v[MAXN], s[MAXN], e[MAXN]；
                                       ^
/in/foo.cc:10:40: error: stray '\274' in program
 int w[MAXN], v[MAXN], s[MAXN], e[MAXN]；
                                        ^
/in/foo.cc:10:41: error: stray '\233' in program
 int w[MAXN], v[MAXN], s[MAXN], e[MAXN]；
                                         ^
/in/foo.cc:13:1: error: expected initializer before 'long'
 long long cal(long long _w)
 ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:25: error: 'e' was not declared in this scope
   scanf("%d%d", &s[i], &e[i]);
                         ^
/in/foo.cc:42:7: error: 'cal' was not declared in this scope
   y = cal(mid);
       ^~~