Compilare: main.cpp: In function 'int main()': main.cpp:25:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for (int i = 1; i <= M; ++i) ^~~ main.cpp:28:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for (int i = 1; i <= M; ++i) { ^~~