Compilare: main.cpp: In function 'int main()': main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<line[i-ly-1].size();j++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<line[i].size();j++) ~^~~~~~~~~~~~~~~ main.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<line[i+ly+1].size();j++) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:61:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<line[i].size();j++) ~^~~~~~~~~~~~~~~ main.cpp:74:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<column[i-lx-1].size();j++) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:76:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<column[i].size();j++) ~^~~~~~~~~~~~~~~~~ main.cpp:83:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<column[i+lx+1].size();j++) ~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:85:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<column[i].size();j++) ~^~~~~~~~~~~~~~~~~