Compilare: main.cpp: In function 'void backtrack()': main.cpp:12:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 12 | for (int j = 1; j <= n; ++j) | ^~~ main.cpp:14:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 14 | sol=0; | ^~~