Compilare: main.cpp: In function 'void add(std::vector<int>&, std::vector<int>&)': main.cpp:11:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0, j=0; i<a.size() or j<b.size()or val; i++, j++){ ~^~~~~~~~~ main.cpp:11:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0, j=0; i<a.size() or j<b.size()or val; i++, j++){ ~^~~~~~~~~ main.cpp:12:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size()) val += a[i]; ~~^~~~~~~~~~ main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j < b.size()) val += b[j]; ~~^~~~~~~~~~ main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < a.size()) ~~^~~~~~~~~~ main.cpp: In function 'void reduce(std::vector<int>&, std::vector<int>&)': main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<a.size(); i++){ ~^~~~~~~~~ main.cpp:37:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i < b.size()) last -= b[i]; ~~^~~~~~~~~~