Compilare: main.cpp: In function 'void btr(int)': main.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < I.size(); i++) ~~^~~~~~~~~~ main.cpp:23:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < I.size(); i++){ ~~^~~~~~~~~~ main.cpp:31:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] int j = p[nl][nc], flag = (i == I.size() - 1); ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &n, &m, &i); ^ main.cpp:68:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &l, &c); ^