Compilare: main.cpp: In function 'int main()': main.cpp:39:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= sir.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i <= sir.size(); i++) ~~^~~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= sir.size(); i++) ~~^~~~~~~~~~~~~