Compilare: main.cpp: In function 'int create(int, int, int)': main.cpp:25:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = x;i < cur.length();++i) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int solve(int, int)': main.cpp:36:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(create(x,y,1) != cur.length() + 1) return 0; ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~ main.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(create(x,y,m) == (cur.length() + m)) { ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j <= cur.length();++j) { ~~^~~~~~~~~~~~~~~ main.cpp:58:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j != cur.length()) newS += cur[j]; ~~^~~~~~~~~~~~~~~