Compilare: main.cpp: In lambda function: main.cpp:181:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (++relaxations[iterator.first] == n) { ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:193:5: warning: 'negative' may be used uninitialized in this function [-Wmaybe-uninitialized] }; ^