Compilare: main.cpp: In function 'int main()': main.cpp:91:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < op.size(); i++) ~~^~~~~~~~~~~ main.cpp: In function 'void stsort(int, int, int)': main.cpp:25:13: warning: 'right' may be used uninitialized in this function [-Wmaybe-uninitialized] int left, right; ^~~~~ main.cpp:25:7: warning: 'left' may be used uninitialized in this function [-Wmaybe-uninitialized] int left, right; ^~~~