Compilare: main.cpp: In function 'int main()': main.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= c.size() + 1; i++) { ~~^~~~~~~~~~~~~~~ main.cpp:19:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < a.size()) { ~~^~~~~~~~~~ main.cpp:25:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < b.size()) { ~~^~~~~~~~~~ main.cpp:31:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < c.size()) { ~~^~~~~~~~~~ main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] v[i] -= (i == c.size() - 1); ~~^~~~~~~~~~~~~~~ main.cpp:43:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < a.size() && a[a.size() - i - 1] == '*') { ~~^~~~~~~~~~ main.cpp:44:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == a.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:49:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < b.size() && b[b.size() - i - 1] == '*') { ~~^~~~~~~~~~ main.cpp:50:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == b.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:55:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < c.size() && c[c.size() - i - 1] == '*') { ~~^~~~~~~~~~ main.cpp:56:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == c.size() - 1) ~~^~~~~~~~~~~~~~~ main.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= c.size() + 1; i++) ~~^~~~~~~~~~~~~~~