Compilare: user.cpp: In function ‘void constrS()’: user.cpp:14:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++) ~^~~ user.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i; j<=n; j++) ~^~~ user.cpp: In function ‘void constrD()’: user.cpp:38:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<=n; j++) ~^~~ user.cpp: In function ‘int main()’: user.cpp:64:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<=n+1; i++) ~^~~~~ user.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<=n+1; j++) ~^~~~~ user.cpp:68:14: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fi>>C+1; ~^~ user.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n-1; i++) ~^~~~~