Compilare: main.cpp: In function 'int main()': main.cpp:38:21: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] else if (s[i] == ']') ^ main.cpp:13:12: warning: unused variable 'j' [-Wunused-variable] int i, j, x, m, cnt = 0; ^ main.cpp:13:15: warning: unused variable 'x' [-Wunused-variable] int i, j, x, m, cnt = 0; ^ main.cpp:13:18: warning: unused variable 'm' [-Wunused-variable] int i, j, x, m, cnt = 0; ^ main.cpp:13:21: warning: unused variable 'cnt' [-Wunused-variable] int i, j, x, m, cnt = 0; ^~~ main.cpp:14:10: warning: unused variable 'ch' [-Wunused-variable] char ch; ^~