Compilare: user.cpp: In function ‘int main()’: user.cpp:83:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++){ ^ user.cpp:86:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=x[i].size()-1) ^ user.cpp:93:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y[i].size();j++){ ^ user.cpp:96:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j!=y[i].size()-1) ^ user.cpp:106:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++) ^ user.cpp:111:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++) ^ user.cpp:123:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y[i].size();j++) ^ user.cpp:128:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y[i].size();j++) ^ user.cpp:139:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++) ^ user.cpp:144:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++) ^ user.cpp:156:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y[i].size();j++) ^ user.cpp:161:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<y[i].size();j++) ^