SIGABRT in STRLCP

[abbiibba]

#include <cstdlib>
#include <iostream>
#include <cstdio>
#include<string>
using namespace std;
string s,sa,sb,chb;
void LCS( string x, string y ) {
     int m,n,small,large;

 m = x.size();
 n = y.size();

 if ( m < n ) {
    small = m;
    large = n;
  }
 else {
    small = n;
    large = m;
 }

 int c[small+1][large+1];

 for ( int i = 1; i <= small; i++ ) c[i][0] = 0;
 for ( int i = 0; i <= large; i++ ) c[0][i] = 0;

 int i = 1;

 while( i <= small ) {
     if( x[i-1] == y[i-1] ) c[i][i] = c[i-1][i-1] + 1;
     else if( x[i-1] != y[i-1] ) break;
     i++;
 }
    printf("%d\n",i-1);
}
int main()
{
    int t,q,i,j;
    char cha;

cin>>t;



while ( t-- ) {


		getline(cin,s);
		cout<<s;
		

	  cin>>q;
      while ( q-- ) {
			
            cin >> cha;
            if ( cha == 'Q' ){
			   cin>>i>>j;
              sa = s.substr(i-1,s.size()-(i-1));
               sb = s.substr(j-1,s.size()-(j-1));
               LCS(sa,sb);
            }
            else if ( cha == 'R' ) {
               cin>>i;
               cin >> chb;
               s.replace(i-1,1,chb);
            }
            else if(cha == 'I')
            {
               cin>>i;
               cin >> chb;
               s.insert(i-1,chb);
            }
      }
}


return 0;
}

when i m using cin for string s........giving wrong answer but when i m using getline its giving sigabrt............plz help

[abbiibba]

#include <cstdlib>
#include <iostream>
#include <cstdio>
#include<string>
using namespace std;
string s,sa,sb,chb;
void LCS( string x, string y ) {
     int m,n,small,large;

 m = x.size();
 n = y.size();

 if ( m < n ) {
    small = m;
    large = n;
  }
 else {
    small = n;
    large = m;
 }

 int c[small+1][large+1];

 for ( int i = 1; i <= small; i++ ) c[i][0] = 0;
 for ( int i = 0; i <= large; i++ ) c[0][i] = 0;

 int i = 1;

 while( i <= small ) {
     if( x[i-1] == y[i-1] ) c[i][i] = c[i-1][i-1] + 1;
     else if( x[i-1] != y[i-1] ) break;
     i++;
 }
    printf("%d\n",i-1);
}
int main()
{
    int t,q,i,j;
    char cha;

scanf("%d\n",&t);



while ( t-- ) {


		getline(cin,s);



	  scanf("%d\n",&q);

      while ( q-- ) {
			
            cin >> cha;

            if ( cha == 'Q' ){
			   scanf("%d %d",&i,&j);
              sa = s.substr(i-1,s.size()-(i-1));
               sb = s.substr(j-1,s.size()-(j-1));
               LCS(sa,sb);
            }
            else if ( cha == 'R' ) {
               scanf("%d",&i);
               cin >> chb;
               s.replace(i-1,1,chb);
            }
            else if(cha == 'I')
            {
               scanf("%d",&i);
               cin >> chb;
               s.insert(i-1,chb);
            }
      }
}


return 0;
}

This code is again Runtime error ....................Plz help

[leppyr64]

What runtime error? SIGABRT is thrown when an assertion fails or when memory is allocated dangerously.