Compilare: main.cpp: In function 'int main()': main.cpp:60:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int u=1;u<=s.size();u++) ~^~~~~~~~~~ main.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int t=u;t<=s.size();t++) ~^~~~~~~~~~ main.cpp:69:30: warning: array subscript has type 'char' [-Wchar-subscripts] coord[a[i][j]]={i,j}; ^ main.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=s.length();i++) ~^~~~~~~~~~~~ main.cpp:79:33: warning: array subscript has type 'char' [-Wchar-subscripts] q.push({coord[s[i-1]].x,coord[s[i-1]].y}); ^ main.cpp:79:49: warning: array subscript has type 'char' [-Wchar-subscripts] q.push({coord[s[i-1]].x,coord[s[i-1]].y}); ^ main.cpp:83:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int lg=2;lg<=s.size();lg++) ~~^~~~~~~~~~ main.cpp:85:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i+lg-1<=s.length();i++) ~~~~~~^~~~~~~~~~~~