Исправить ошибки в программе

#include <vector> 
#include <limits> 
using namespace std; 
 
int n, minrow, INF; 
vector < vector<int> > a; 
vector<int> xy, yx; 
vector<char> vx, vy; 
vector<int> maxrow, mincol;
bool dotry (int i) { 
if (vx[i]) return false; 
vx[i] = true; 
for (int j=0; j<n; ++j) 
if (a[i][j]-maxrow[i]-mincol[j] == 0) 
vy[j] = true; 
for (int j=0; j<n; ++j) 
if (a[i][j]-maxrow[i]-mincol[j] == 0 && yx[j] == -1) { 
xy[i] = j; 
yx[j] = i; 
return true; 
} 
for (int j=0; j<n; ++j) 
if (a[i][j]-maxrow[i]-mincol[j] == 0 && dotry (yx[j])) { 
xy[i] = j; 
yx[j] = i; 
return true; 
} 
return false; 
} 
 
int main() { 
 
// ... чтение a ... 
 
mincol.assign (n, 0); 
minrow.assign (n, 0); 
for (int i=0; i<n; ++i) 
for (int j=0; j<n; ++j) 
maxrow[i] = max (maxrow[i], a[i][j]); 
 
xy.assign (n, -1); 
yx.assign (n, -1); 
for (int c=0; c<n; ) { 
vx.assign (n, 0); 
vy.assign (n, 0); 
int k = 0; 
for (int i=0; i<n; ++i) 
if (xy[i] == -1 && dotry (i)) 
++k; 
c += k; 
if (k == 0) { 
int z = INF; 
for (int i=0; i<n; ++i) 
if (vx[i]) 
for (int j=0; j<n; ++j) 
if (!vy[j]) 
z = min (z, maxrow[i]+mincol[j]-a[i][j]); 
for (int i=0; i<n; ++i) { 
if (vx[i]) maxrow[i] -= z; 
if (vy[i]) mincol[i] += z; 
} 
} 
} 
 
int ans = 0; 
for (int i=0; i<n; ++i) 
ans += a[i][xy[i]]; 
printf ("%d\n", ans); 
for (int i=0; i<n; ++i) 
printf ("%d ", xy[i]+1); 
}

if (vx[i]) return false;

vx[i] = true;