Compilare: main.cpp: In function 'void read()': main.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < s.size(); j++) ~~^~~~~~~~~~ main.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < s.size(); j++) ~~^~~~~~~~~~ main.cpp:23:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = j + 1; k < s.size(); k++) ~~^~~~~~~~~~ main.cpp:27:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < s.size(); j++) ~~^~~~~~~~~~ main.cpp: In function 'void output()': main.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sir[i].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sir[i].size(); j++) ~~^~~~~~~~~~~~~~~ main.cpp:45:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = j + 1; k < sir[i].size(); k++) ~~^~~~~~~~~~~~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < sir[i].size(); j++) ~~^~~~~~~~~~~~~~~