Compilare: main.cpp: In function 'void solve()': main.cpp:27:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation] while(matrix[i][j]) ^~~~~ main.cpp:30:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while' reverse(elem.begin(), elem.end()); ^~~~~~~