Compilare: main.cpp: In function 'int main()': main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<=n; ++i) ~^~~ main.cpp:22:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=1; j<=n; ++j) ~^~~ main.cpp:59:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=st; i<=dr; ++i) ~^~~~ main.cpp:64:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(x!=n) ~^~~ main.cpp:70:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[x+1][y]==v[x+1][y+1]&&nr>v[y][x+2]) ~~^~~~~~~~~~