Compilare: user.cpp: In function ‘int main()’: user.cpp:31:75: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=0;l<a[h].size();l++) ^ user.cpp:39:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<c[j-1].size();h++) ^ user.cpp:42:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<c[j+k-1].size();h++) ^ user.cpp:48:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<a[i-1].size();h++) ^ user.cpp:51:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<a[i+k-1].size();h++) ^ user.cpp:58:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<a[i-1].size();h++) ^ user.cpp:61:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<a[i+k-1].size();h++) ^ user.cpp:65:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<c[j-1].size();h++) ^ user.cpp:68:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<c[j+k-1].size();h++) ^