Compilare: main.cpp: In function 'void writeData()': main.cpp:70:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (path.size() != n + 1) ~~~~~~~~~~~~^~~~~~~~ main.cpp:5:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FOR(i, a, b) for(int i = (a); i <= (b); ++i) ^ main.cpp:76:2: note: in expansion of macro 'FOR' FOR(i, 0, path.size() - 2) ^~~ main.cpp:81:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (aux < input[x][y].size()) ~~~~^~~~~~~~~~~~~~~~~~~~