Compilare: main.cpp: In function 'int rec(int, int)': main.cpp:23:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < A[last].size(); ++i) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:54:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < A[0].size(); ++j) ~~^~~~~~~~~~~~~ main.cpp:54:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(j = 0; j < A[0].size(); ++j) ^~~ main.cpp:58:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' if(Sol != inf) fout << Sol; ^~ main.cpp:36:9: warning: unused variable 'i' [-Wunused-variable] int i, j, x, y, c, n, m, Sol; ^